Why Does My Sex Drive Come and Go?
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Why does my sex drive come and go? Because desire moves over time in most people, and the research that tracked the same individuals repeatedly found that movement to be ordinary. Harris and colleagues measured desire across three longitudinal samples: 5,562 self-reported observations at three time points spanning 13 years, plus 11,282 moment-to-moment reports collected over seven days in two further studies. Across years, women reported more variability in desire than men. Across a single week, the researchers found no significant difference between women's and men's variability. In both groups, desire tracked how people felt and how close they felt to a partner. So a flat month after a good month is the documented shape of desire in one life. It is a weak signal about whether anything is broken, and a weak signal about whether something you tried has stopped working.
- In the longitudinal data, women's desire varied more than men's when it was measured across 13 years. Over seven days of moment-to-moment reports, that sex difference in variability did not appear.
- Desire moved with mood and with felt closeness to a partner in both women and men. In one of the three studies, women's desire was more negatively associated with tiredness and anger.
- Daily-diary work in naturally cycling women found day-to-day desire rising toward mid-cycle and falling afterward, with progesterone statistically mediating the fall. That is one documented source of the "one good week then the drop" experience.
- In 67,334 Estonian Biobank adults, gender, age, orientation, relationship status, parenthood, education, occupation, and relationship satisfaction together accounted for 28.3% of the variation in self-reported desire. Most of the variation sat outside those variables.
- In a separate Finnish sample of 2,173 women surveyed twice seven years apart, sexual function varied considerably across that stretch, and the authors read most of the variance in later function as explained by something other than previous function.
- A single bad month is thin evidence about a long-run trend. Judging a change from one month is like judging a stock from one day.
- NUUD is a botanical supplement for the desire side. Nothing here says it flattens the ups and downs, because no study has tested that.
Figures from Harris et al. 2023 (PMID 36695962) and Aavik et al. 2026 (PMID 41491164). All three are self-reported measures.
Is this normal? What happens when researchers measure the same people twice
Most of what gets published about desire is a snapshot. Researchers survey a large group once, average the answers, and report a number for women and a number for men. A snapshot cannot tell you anything about whether one person's desire holds still, because it only ever sees that person once.
Harris and colleagues went after the harder question directly. Their paper opens by naming the lay assumption they set out to test: that women's desire swings around and men's stays put. They tested it across three longitudinal studies. Study 1 measured desire at three time points spanning 13 years, giving 5,562 observations. Studies 2 and 3 measured desire moment to moment across seven days, giving 11,282 observations between them.
The answer came out split by timescale. Over years, women were more variable in their desire than men. Over the short term, in both of the week-long studies, the researchers found no significant differences in women's and men's desire variability. The degree to which desire moved with feelings like happiness, and with relationship states like partner closeness, was similar in women and men, with some exceptions: in Study 2, women's desire was more negatively associated with tiredness and with anger. The authors summed up their own result as qualifying existing assumptions about sex differences in desire variability (Harris et al., 2023).
From inside your own life, the finding is bigger than a sex difference. Desire in these samples moved with how tired you were, how angry you were, and how close you felt to your partner. Those things move constantly. A measure that tracks them is going to move too.
What within-person variability looks like over a year
Illustrative only. The three lines are drawn shapes, made to show the pattern the longitudinal research describes. They are drawn data and no study reported these points.
Shapes drawn to illustrate the within-person pattern described in Harris et al. 2023 (PMID 36695962), which measured 5,562 observations across 13 years and 11,282 moment-to-moment observations over seven days. The lines above carry no study values.
Look at Person A. Two months in that year sit at the bottom of the range, and both recover. Survey Person A once in month 5 and you record someone with average desire. Survey the same person in month 9 and you record someone with a problem. Same person, same year, and only repeated measurement tells you which reading was the fluke.
"One good week then the drop"
People describe it that way in their own words, and there is measurement behind it. Roney and Simmons collected daily saliva samples across one to two menstrual cycles in naturally cycling young women, assayed them for estradiol, progesterone, and testosterone, and paired them with daily diary reports of sexual behavior and subjective desire.
Day-to-day desire within the cycle showed positive effects of estradiol and negative effects of progesterone. Desire peaked around mid-cycle, in line with earlier findings, and progesterone concentrations statistically mediated the fall in desire from mid-cycle onward into the luteal phase. The rise before mid-cycle was left unexplained by the hormones they measured, which the authors flag as pointing to signals they did not capture. Between-women comparisons and between-cycle comparisons within the same woman produced generally absent effects, with the authors noting limited statistical power at those levels (Roney and Simmons, 2013).
A within-month rise and fall in desire is a measured, hormone-linked pattern in naturally cycling women, so the woman describing one good week and then ten days of feeling nothing is describing something the daily-diary data recognizes. The limit sits right next to it. This is a small daily-diary study of subjective reports, it says nothing about what any individual woman's chart looks like, and it says nothing about scheduling around a calendar. We are not going to tell you which day to do anything. Nobody has the data to make that call for you.
Fluctuation has other documented company. Hormonal contraception changes the picture for some people, which we covered separately in our piece on birth control, libido, and the drop in sensation.
Relapse or normal fluctuation? A reality check
Three readings people reach for after a flat stretch, and what the longitudinal work supports.
Sources: Harris et al. 2023 (PMID 36695962) and Roney and Simmons 2013 (PMID 23601091). Both rely on self-reported desire.
"The spark is gone for good"
The fear doing the damage is permanence. A flat month on its own is survivable. The belief that this is the new floor, that the version of you who wanted sex has left the building, turns a stretch of weeks into a decision about your relationship.
Nothing in the measurement supports treating one low reading as a floor. In the longitudinal data, desire went down and it came back up, repeatedly, in the same people. That is what variability means. A measure that only ever went down would be called a decline, and researchers have a separate literature for that.
A second longitudinal dataset, collected independently in another country, points the same way. Gunst and colleagues drew on 2,173 Finnish women who took part in two large population-based data collections seven years apart. Their stated conclusion is that female sexual function varied considerably over those seven years. The standardized paths linking a woman's earlier scores to her later ones ranged from 0.136 to 0.447, which the authors read as most of the variance in later function being explained by something other than previous function. Relationship status mattered to how stable the picture was, and the authors concluded that partner-specific factors belong in any assessment of stability over time (Gunst et al., 2017).
Where a woman sat seven years earlier told you surprisingly little about where she sat later. If seven years of distance leaves that much room for change, a flat autumn is a poor basis for a verdict about the rest of your life.
The decline literature is real and we have written about it: desire does tend to fall with relationship duration in women in several datasets, and it does tend to fall with age. Our piece on what happens when the new wears off covers the duration side, and the 67,000-person Estonian dataset covers the age curve. Both describe slow group-level trends measured across many people. Neither one predicts your March from your February. Confusing a multi-year trend with this month's reading is an easy mistake to make about your own desire.
"Back to my usual level": what usual even means
People reach for a personal baseline, some true number their desire is supposed to return to. The large surveys make that idea harder to hold.
Aavik and colleagues used the Estonian Biobank, a sample of 67,334 adults, and tested how gender, age, sexual orientation, relationship status, recent childbirth, number of children, relationship satisfaction, education, and occupation related to self-reported desire. Men reported substantially higher desire than women. Desire declined with age, more steeply in women, and was positively associated with relationship satisfaction, recent childbirth, and bisexual and pansexual orientation. Their multivariate models explained 28.3% of the variance in desire, with gender and age the strongest predictors (Aavik et al., 2026).
Everything demographic and relational those researchers could put in the model accounted for a bit over a quarter of why people differ. The rest sits in health, stress, sleep, what happened that week, and the ordinary movement Harris measured. Your "usual level" is a range you move through.
Wieczorek and colleagues add a further complication. In a sample of more than 8,000 people aged 14.6 to 80.2 years, they measured three separate facets of desire: dyadic desire relating to a partner, dyadic desire relating to an attractive person, and solitary desire. Associations between age and desire followed nonlinear trends and differed by gender and by which facet was measured (Wieczorek et al., 2022). Desire toward your partner and desire on your own can move independently. Someone reporting a dead month may have one facet down and another unchanged, and a single self-rating flattens all of it into one number.
Normal fluctuation and the patterns that deserve a checkup
Normalizing variability has a hard edge. Some changes deserve a clinician's eyes, and calling everything normal would be its own kind of dishonesty.
| What you are noticing | Fits the documented pattern of fluctuation | Worth taking to a clinician |
|---|---|---|
| Timing | Weeks or a couple of months, with earlier stretches that came back on their own | Six months or longer of consistently absent desire with no recovery in between |
| Pattern shape | Up and down, sometimes with an obvious driver like a bad work stretch, poor sleep, or a rough patch at home | A single sharp drop that never lifts, especially one you can date to a specific week |
| Medication | No change to what you take | Onset lines up with a new prescription, a dose change, or a change in contraception |
| Other symptoms | Everything else feels much as it did | Pain, a change in bleeding, unusual fatigue, mood changes, or anything else new alongside it |
| How it sits with you | Annoying, and you can name good weeks in recent memory | Genuine distress, or strain on your relationship that keeps building |
The distress column matters most. Clinicians use distress and duration to separate ordinary variation from a condition worth treating, and only a clinician makes that call. If your own answer is that it bothers you a great deal, that is reason enough to book the appointment, whatever a chart in a blog post says.
How to read your own pattern without fooling yourself
Judging desire from memory goes badly, because a flat week is easy to recall and an ordinary good week leaves no trace.
- Give it three months before you draw a line. The research that saw variability saw it because it measured people repeatedly. One month is one point, and you cannot get a slope out of one point.
- Write down two numbers a week, and keep it boring. Desire in the last few days on a one-to-ten scale, plus sleep. Thirty seconds. Guessing at what last month felt like is where people go wrong.
- Log tiredness and anger next to it. Those two were more negatively associated with women's desire in one of the Harris studies, and both are things you can name in a word.
- Separate the facets. Note desire toward your partner separately from desire on your own, because the age study found those facets move differently.
- Compare your low weeks with your own past low weeks. Comparing yourself with someone else's summary of their sex life is comparing a live reading with a highlight.
- Before you conclude a change caused something, check whether you started it during a low stretch. Anything begun at your low point looks like it worked, because the next reading was likely to come up on its own.
That last one cuts against every product in this category, ours included. People start supplements at their worst point, and some of what follows is the line coming back up the way lines do.
"I want the old us back"
Couples usually arrive at this with a comparison in hand: the first year, when neither of you could keep your hands off the other. Two datasets speak to that comparison, and both come with limits worth stating.
Murray and Milhausen surveyed 170 undergraduates aged 18 to 25. Women's desire was significantly and negatively predicted by relationship duration after controlling for age, relationship satisfaction, and sexual satisfaction. Men's desire showed no significant effect from duration (Murray and Milhausen, 2012). Keep the sample in view: 170 young students, surveyed once. A small cross-sectional sample cannot follow any couple through time.
Klusmann analyzed a larger German student survey, 1,865 heterosexual respondents aged 19 to 32 in steady partnerships. Sexual activity and sexual satisfaction declined in both women and men as partnership duration rose. Sexual desire declined only in women. Desire for tenderness declined in men and rose in women. The author states the limit himself: because the results are cross-sectional, a longitudinal explanation is precarious, and individual differences in who happens to be in a long partnership at survey time may account for part of the finding (Klusmann, 2002).
Duration and desire are associated in these samples. Both studies surveyed different people at different stages, and neither followed one couple through time. That leaves something modest and still useful: the drop-off in early-relationship intensity is widely reported, and it does not run on the same clock as the week-to-week movement this article is about. If the shape you recognize is more about what starts desire in the first place, our piece on responsive and spontaneous desire is the better read, and how common mismatched libido actually is covers the two-person version of the problem.
"I just want to feel normal again"
Feeling normal again may not require desire to hold still, because the measurement says it does not hold still in the people researchers followed. Most of the levers that help cost nothing. There is one you can buy if you want to.
Sleep first. Tiredness was one of the states most negatively associated with women's desire in the Harris data, and it is free to fix badly and cheap to fix well. Then the stress load, then whatever has been sitting unresolved with your partner, since felt closeness moved with desire in both women and men across those studies. Then medication: if the drop dates to a new prescription or a contraceptive change, that is a conversation with the prescriber and no supplement substitutes for it.
After those, a botanical supplement is a reasonable thing to try, with a clear head about what it does. NUUD is built around the NUUD Mushroom Complex™ at 150mg, with Muira Puama, Boiled Rehmannia Root, Tribulus Terrestris, and Piper Nigrum for absorption. It works on the desire side, with onset at 30 to 60 minutes and up to 6 days of duration per capsule dose. If that is the lever you want to add, our women's libido support capsules are the format built for it. We will not tell you that it smooths out the ups and downs, because nobody has run that study, and any brand claiming otherwise is describing a trial that does not exist.
Keep reading
- Responsive and spontaneous desire
- When the new wears off
- What 67,000 people reveal about sexual desire
- How common is mismatched libido
- Birth control, libido, and sensation
Frequently asked questions
Why does my sex drive come and go?
Because desire measured repeatedly in the same people moves, and that movement is the documented pattern. Harris and colleagues measured desire across three longitudinal studies: 5,562 self-reported observations at three time points spanning 13 years, and 11,282 moment-to-moment observations over seven days. Desire varied with feelings such as happiness and with relationship states such as partner closeness in both women and men. In one study, women's desire was more negatively associated with tiredness and anger. Sleep, stress, medication, relationship state, and for cycling women the hormonal pattern across the month all move, so a measure that tracks them moves too.
Is it normal for libido to change from month to month?
Yes, based on the longitudinal evidence. When Harris and colleagues measured self-reported desire across 13 years, women were more variable than men, and when they measured it moment to moment over seven days, they found no significant sex difference in variability. Both results describe desire that goes up and down within the same person. Separately, daily-diary work in naturally cycling women found desire rising toward mid-cycle and falling afterward, with progesterone statistically mediating the fall. A second longitudinal study, of 2,173 Finnish women surveyed twice seven years apart, likewise found sexual function varying considerably over that period. Month-to-month change is the ordinary case in this research.
My sex drive came back for a week and then disappeared. Did something stop working?
One week tells you very little either way. In the longitudinal data, the same people reported desire that rose and fell repeatedly, so a good week followed by a flat stretch is the shape the research describes. A fair read on whether anything helped needs several months of observations, ideally written down at the time. There is also a trap in the timing: people usually start something new at their lowest point, and the reading after a low point tends to come up anyway.
Does sex drive fluctuate more in women than in men?
It depends on the timescale, according to the one study that tested both. Across 13 years and 5,562 self-reported observations, women were more variable in their desire than men. Across seven days of moment-to-moment reports totaling 11,282 observations, there were no significant differences in women's and men's variability. The authors described their findings as qualifying the assumption that women's desire is variable while men's is stable. Both figures come from self-reported desire.
When is a change in sex drive worth seeing a doctor about?
When it lasts, when it comes with other symptoms, or when it distresses you. Roughly six months or longer of consistently absent desire with no recovery in between is worth an appointment, as is a sharp drop you can date to a new medication, a dose change, or a change in contraception. Pain, a change in bleeding, unusual fatigue, or new mood changes alongside it are all reasons to go sooner. Genuine distress is reason enough on its own, whatever the duration. A licensed clinician makes that call.
References
- Harris EA, Hornsey MJ, Hofmann W, Jern P, Murphy SC, Hedenborg F, Barlow FK. Does Sexual Desire Fluctuate More Among Women than Men? Archives of Sexual Behavior. 2023. https://pubmed.ncbi.nlm.nih.gov/36695962/
- Roney JR, Simmons ZL. Hormonal predictors of sexual motivation in natural menstrual cycles. Hormones and Behavior. 2013. https://pubmed.ncbi.nlm.nih.gov/23601091/
- Gunst A, Ventus D, Kärnä A, Salo P, Jern P. Female sexual function varies over time and is dependent on partner-specific factors: a population-based longitudinal analysis of six sexual function domains. Psychological Medicine. 2017. https://pubmed.ncbi.nlm.nih.gov/27766993/
- Aavik T, Täht K, Vainik U, Mõttus R. Associations of Sexual Desire with Demographic and Relationship Variables. Scientific Reports. 2026. https://pubmed.ncbi.nlm.nih.gov/41491164/
- Wieczorek LL, Chivers M, Koehn MA, DeBruine LM, Jones BC. Age Effects on Women's and Men's Dyadic and Solitary Sexual Desire. Archives of Sexual Behavior. 2022. https://pubmed.ncbi.nlm.nih.gov/35916987/
- Murray SH, Milhausen RR. Sexual desire and relationship duration in young men and women. Journal of Sex and Marital Therapy. 2012. https://pubmed.ncbi.nlm.nih.gov/22268980/
- Klusmann D. Sexual motivation and the duration of partnership. Archives of Sexual Behavior. 2002. https://pubmed.ncbi.nlm.nih.gov/12049023/
This article is for general education and is not medical advice. NUUD is a botanical supplement and is not a treatment for any condition. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Talk with a licensed clinician about persistent changes in desire, distress about your sex life, or any medication before starting a new supplement.
