Most married couples have sex about once a week, and that number lines up with what research consistently identifies as the sweet spot for relationship satisfaction. Americans in their 20s average about 80 times per year (roughly 1.5 times per week), while those in their 60s average closer to 20 times per year (about every other week). But averages only tell part of the story, and what’s “normal” varies enormously depending on age, life stage, health, and the unique dynamics of your relationship.
The Once-a-Week Sweet Spot
A large study published by the Society for Personality and Social Psychology found that couples who had sex once a week reported the highest relationship satisfaction. Couples who had sex more often than that didn’t report any additional boost in happiness. The takeaway isn’t that once a week is a magic number, but that maintaining a regular intimate connection matters more than chasing a high frequency. As the researchers put it, you don’t need to have sex every day as long as you’re maintaining that connection.
Interestingly, the link between sex and happiness was stronger for relationship satisfaction than for overall life satisfaction. In other words, regular sex makes you feel closer to your partner, but it won’t single-handedly make everything else in life feel better.
How Frequency Changes With Age
A 2020 survey broke down how often adults have sex at least once per week across different age brackets. Among adults 25 to 44, roughly half of men and just over half of women reported weekly sex. For the 18-to-24 group, the numbers were slightly lower for men (37%) but higher for women (52%). After age 50, frequency tends to drop more noticeably. A study from Ireland found that 75% of people aged 50 to 64 were still sexually active, but that dropped to 23% among those 75 and older.
The decline is gradual, not a cliff. Americans in their 20s average about 80 times per year. By the 60s, that number is closer to 20 times per year. Most couples experience a slow, steady shift rather than a sudden stop.
Why Parenthood Changes Everything
Few life events reshape a couple’s sex life as dramatically as having a first child. Research tracking first-time parents found that couples resumed sex about three months after delivery, but frequency dropped to roughly once or twice a month. The gap in desire was striking: new mothers reported wanting sex about twice a month to once a week, while new fathers reported wanting it two times a week to once a day.
That mismatch doesn’t necessarily resolve quickly. A follow-up study four years after the birth of a first child found that fewer than half of parents (about 46%) were sexually content, and fathers were less satisfied than mothers. Sexual frequency and contentment declined over the years of early parenthood, even as other parts of the relationship stabilized. This is one of the most common and least talked-about shifts in married life, and it doesn’t mean the relationship is in trouble.
Common Reasons Frequency Drops
Up to 80% of couples regularly experience a desire gap, where one partner wants sex and the other doesn’t. That mismatch is the norm, not the exception, and it fluctuates over time. Several specific factors drive it.
Hormonal changes play a major role, especially around menopause. Declining estrogen reduces desire, slows arousal, and can make sex physically uncomfortable. Reduced lubrication and changes in vaginal tissue cause pain for many women. In one study, up to 50% of menopausal women reported low sexual desire, up to 30% reported poor lubrication, and up to 45% reported genital pain before, during, or after intercourse. Half of women in their 50s report continued sexual activity, but that drops to 27% by the 70s.
Chronic health conditions are another significant factor. A 2024 study found that 76% of both men and women with conditions like high blood pressure, depression, diabetes, or heart disease reported some form of sexual impairment. High blood pressure was particularly problematic: nearly 78% of men with hypertension-related issues reported erectile dysfunction.
Medications contribute too. An estimated 25% of all erectile dysfunction cases are side effects of prescription drugs. Antidepressants known as SSRIs are especially common culprits. In a 2023 study, 43% of men and women taking an SSRI reported sexual or romantic side effects, and women were more than twice as likely as men to be prescribed one in the first place.
What Counts as a “Sexless” Marriage
Researchers generally define a sexless marriage as one in which a couple has sex fewer than 10 times per year. By that standard, about 20% of American marriages qualify. That label can feel alarming, but it doesn’t automatically signal a loveless or failing relationship. Some couples are genuinely content with very little sex, particularly later in life or when both partners have low desire. The problem arises when there’s a significant gap between what one partner wants and what’s actually happening.
If your frequency has dropped well below what either of you wants, the pattern is worth paying attention to. But comparing yourself to national averages is less useful than having an honest conversation about whether your current rhythm works for both of you. The couples who report the highest satisfaction aren’t the ones having the most sex. They’re the ones whose expectations and reality are roughly aligned.