← Read
The question of whether hormonal contraception reduces libido sits in an uncomfortable space between two camps. One insists that any reported decrease is psychological, nocebo, or relationship-based; the other treats contraception as straightforwardly responsible for all manner of sexual difficulty. The research occupies a more honest middle ground: there is a plausible physiological mechanism, there is evidence of modest effects in some populations, and there is also significant individual variation and methodological complexity that makes sweeping claims in either direction unsupported. What follows is what the evidence actually says - without dismissing the experience of people who notice a real change, and without catastrophising what is in most cases a manageable issue.
The primary physiological mechanism proposed to explain a link between combined oral contraceptives (COCs) and reduced libido involves sex hormone binding globulin, known as SHBG. This is a protein produced mainly in the liver that circulates in the bloodstream and binds to sex hormones - including testosterone - rendering them biologically inactive. Only "free" (unbound) testosterone can cross cell membranes and act on tissues.
Combined oral contraceptives, which contain both synthetic oestrogen and progestin, significantly raise circulating SHBG levels. The oestrogen component is the primary driver of this increase. Higher SHBG binds more testosterone, leaving less free testosterone available to tissues - including the brain structures and genital tissues involved in sexual desire and arousal.
Research by Davis and Castano, reviewing androgens and female sexuality, confirmed that testosterone plays a meaningful role in sexual desire in women. This is not a new finding - the role of androgens in women's libido has been studied since at least the 1980s - but it is still underappreciated in clinical practice. If a woman already has lower free testosterone for other reasons (age, adrenal function, individual variation), a further reduction driven by SHBG increase from COCs could push her below a functional threshold for desire.
Importantly, SHBG levels do not return to pre-pill baseline immediately after stopping combined oral contraceptives. Some research has found that SHBG levels remain elevated for months after discontinuation, which may explain why some women report continued low libido even after stopping hormonal contraception.
A landmark randomised controlled trial by Zethraeus and colleagues, published in 2016 in the journal Fertility and Sterility (PubMed 26459993), is one of the better-designed studies on this question. It randomised healthy women with no sexual dysfunction at baseline to either a combined oral contraceptive (levonorgestrel plus ethinyl estradiol) or placebo for three months, using validated questionnaires to measure sexual function and mood. The study found modest but statistically significant reductions in sexual desire and mood in the OCP group compared to placebo. This is a cleaner finding than most prior studies because the crossover design and placebo control remove many of the confounders that plague observational research in this area.
The effect sizes were modest - this was not a dramatic deterioration, but a measurable shift. And not all participants experienced the change: individual variation was substantial. Some women in the treatment group reported no change or even improvements, while others reported more pronounced effects.
Burrows and colleagues reviewed the literature on oral contraceptives and sexual function in 2012, finding a mixed picture across studies - some showing negative effects, some no effect, and a smaller number showing improvements. The review highlighted methodological inconsistency across studies as a major reason for the conflicting findings: different formulations, different outcome measures, different study durations, and different populations make direct comparison difficult.
The research is genuinely complicated by factors that are hard to control for, and acknowledging them is important for reading any single study accurately.
Pregnancy anxiety. For many people, starting effective contraception also removes the anxiety associated with unintended pregnancy. Anxiety is a consistent inhibitor of sexual desire via the dual control model's inhibition system. Removing that anxiety can increase desire independently of any hormonal effect. This means studies that compare people who use hormonal contraception against those who use no contraception are confounded by the fact that effective contraception removes a significant anxiety load. The cleaner comparison is against a non-hormonal method that also provides effective pregnancy prevention - but these studies are less common.
Relationship effects over time. Many women begin hormonal contraception at the start of a new relationship. Libido in long-term relationships tends to decrease over time due to habituation, independent of contraception. Studies that follow couples over time and attribute changes in desire to contraception may be conflating relationship habituation effects with hormonal effects.
Formulation heterogeneity. "The pill" is not a single drug. Different combined oral contraceptives contain different progestins, different doses of oestrogen, and different ratios of the two. Progestins vary considerably in their androgenic or anti-androgenic properties - some progestins block androgen receptors directly, which could compound the free testosterone reduction driven by SHBG. Studies that lump all COCs together as if they are equivalent are not measuring a single intervention.
Not all hormonal contraceptives work the same way, and the SHBG-testosterone pathway applies most clearly to combined methods containing oestrogen.
Progestin-only methods (the mini-pill, hormonal IUDs, the implant, the injection) do not contain oestrogen and therefore do not produce the same increase in SHBG. Hormonal IUDs, in particular, release progestin locally into the uterus with very low systemic absorption, meaning blood levels of progestin are minimal and systemic hormonal effects are limited. For people concerned about libido effects, progestin-only methods - particularly the hormonal IUD - are often worth discussing with a prescriber as a first alternative.
Non-hormonal methods - the copper IUD, condoms, diaphragms, and cervical caps - do not alter hormone levels and therefore have no direct physiological pathway to reduced desire. Some people report increased libido after switching to the copper IUD, which may reflect either genuine hormonal recovery from previous combined pill use or the removal of pregnancy anxiety with less hormonal side-effect burden. The copper IUD does have higher rates of heavier or more painful periods than hormonal methods for some users, which is a separate consideration.
The most useful approach starts with documentation. If you suspect a contraceptive is affecting your desire, note the timing - when did you start the method, when did the change appear, has the pattern been consistent? Changes that emerge within the first few months of starting a new method and persist are more likely to be related to the method than changes that emerge two years into using the same formulation without other changes in life circumstances.
Talk to your prescriber specifically about the sexual function concern. This conversation is often not initiated because it feels tangential to the primary purpose of the prescription, but it is a legitimate and relevant side effect that deserves direct attention. You can ask about switching to a different formulation - for example, a COC with a more androgenically neutral progestin - or about non-oestrogenic alternatives. Prescribers cannot help with a concern they do not know about.
It is also worth holding the experience with some calibration. The research suggests that the effect, when present, tends to be modest and is not experienced by all users. If you have been on the same method for several years without a clear change in desire, it is unlikely to be the primary driver of any current low libido. The causes of low desire are usually multifactorial - stress, relationship dynamics, mental health, sleep, general physical health - and isolating contraception as the single cause requires ruling out other factors.
If you stop a hormonal method and continue to notice low desire, it is worth waiting several months before evaluating whether the change has been hormonal - SHBG can take time to return to its natural baseline. Your experience is valid data about your own body, and it deserves a prescriber who engages with it seriously rather than dismissing it.