Libido changes throughout the menstrual cycle because oestrogen and testosterone rise before ovulation, then progesterone rises and suppresses desire. Desire typically peaks near ovulation and dips before a period starts.
Libido changes throughout the menstrual cycle because oestrogen and testosterone rise in the days leading up to ovulation and heighten sexual desire, while progesterone rises afterward and suppresses it. Desire typically peaks in the fertile window just before ovulation and dips in the late luteal phase, in the days before a period starts.
Why Does Libido Change Throughout the Menstrual Cycle?
This article is based on peer-reviewed research published in Hormones and Behavior and the Journal of Sex Research, alongside NHS guidance on the menstrual cycle current as of August 2026. A study on hormonal predictors of sexual motivation (PMID: 23601091) tracked daily saliva hormone levels and diary reports across natural monthly cycles and found that oestrogen consistently predicted higher sexual desire and behavior, while progesterone was a consistent negative predictor, explaining much of the fall in desire from mid-cycle into the luteal phase. Solu connects logged mood and desire entries to the hormone pattern typical of a woman's current cycle phase, which can help clarify whether a dip in interest lines up with the expected luteal-phase progesterone rise rather than feeling like an unexplained shift in mood or attraction.
Which Hormones Drive Changes in Sexual Desire?
Three hormones account for most of the shift in libido across a typical cycle: oestrogen, progesterone, and, to a lesser extent, testosterone. Oestrogen rises steadily through the follicular phase and peaks just before ovulation, and research consistently links this rise to increased sexual interest, confidence, and, for some women, more attention to appearance. Progesterone rises sharply after ovulation during the luteal phase and has a well-documented suppressive effect on desire, part of the same hormonal shift explored in the guide to why anxiety often increases before a period. Testosterone, though present in much smaller amounts in women than in men, spikes briefly around ovulation, but the same 2013 study found it did not independently predict sexual motivation once oestrogen and progesterone were accounted for.
When in Your Cycle Is Libido Usually Highest?
Sexual desire is typically highest in the days immediately surrounding ovulation, when oestrogen is at its peak and conception is biologically possible. A 2022 study in the Journal of Sex Research measured oestrogen and progesterone in 97 women across peri-ovulatory and luteal testing sessions and found a significant difference in sexual desire and activity frequency between the two phases, with within-subject oestrogen positively, and progesterone negatively, predicting desire. Solu compares a low-libido week against a woman's own ovulation and period history rather than treating it as an isolated data point, so a pattern of peaks and dips becomes visible across several cycles instead of one. This is the same mechanism behind the phase-by-phase changes covered in the guide to understanding your four cycle phases.
What Are Other Signs Linked to the Same Hormonal Shifts?
The hormones that drive libido changes also influence several other symptoms women notice at the same points in their cycle. A quick phase-by-phase breakdown of how desire typically tracks:
- Menstrual phase: desire is often lowest, alongside low oestrogen and progesterone
- Follicular phase: desire begins rising as oestrogen climbs toward ovulation
- Ovulatory phase: desire typically peaks alongside the oestrogen and LH surge
- Luteal phase: desire declines as progesterone rises, dropping further in the late luteal phase
Women who track energy, mood, and desire alongside cycle phase often notice their motivation to initiate intimacy tracks more closely with rising oestrogen near ovulation than with any particular day of the week or external circumstance. This overlaps with common questions like "why is my sex drive so low before my period" and "can hormones explain low libido," both of which point to the same luteal-phase progesterone rise rather than a psychological cause alone.
Is a Change in Libido Ever a Sign Something Is Wrong?
Cyclical changes in desire are expected and generally not a cause for concern on their own, but a persistent, unexplained drop in libido across most or all of the cycle can sometimes point to an underlying hormonal imbalance. NHS guidance on the menstrual cycle notes that conditions affecting oestrogen or thyroid hormone levels can flatten the usual mid-cycle rise in desire, which is worth discussing with a doctor if it persists for several months. For a broader look at what a flattened hormonal pattern can indicate, see the guide to whether there is an app for hormonal imbalance.
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