Most couples in established relationships have sex about once a week, and that number holds surprisingly steady across early adulthood through the mid-40s. Around half of adults between 25 and 44 report having sex at least once per week, according to a 2020 survey. But averages only tell part of the story. What matters more is whether the frequency you and your partner have works for both of you.
Frequency by Age Group
Sexual frequency doesn’t change as dramatically across age groups as most people assume. Among adults 25 to 34, about 50% of men and 54% of women have sex at least once a week. The numbers for those 35 to 44 are nearly identical: 50% of men and 53% of women. The youngest adults (18 to 24) actually report slightly lower rates, with 37% of men and 52% of women hitting that once-a-week mark, likely because fewer people in that age range are in committed relationships.
Frequency does taper later in life, but sexual activity doesn’t disappear. About 75% of people aged 50 to 64 remain sexually active. That number drops more significantly after 75, where roughly 23% report ongoing sexual activity. The decline is driven less by desire and more by practical factors: health conditions, medication side effects, hormonal shifts, and the availability of a partner.
The Once-a-Week Happiness Plateau
If you’re wondering whether more sex automatically means a happier relationship, the answer is no. Research has consistently found that relationship satisfaction increases with sexual frequency up to about once per week, then plateaus. Having sex three or four times a week doesn’t make couples measurably happier than once a week does.
A study published in the Journal of Economic Behavior & Organization tested this directly by asking some couples to double their sexual frequency. The couples who had more sex didn’t report being happier. The researchers concluded that artificially increasing frequency actually reduced both the desire for and enjoyment of sex. In other words, quality and genuine desire matter far more than hitting a number.
What Counts as a “Sexless” Relationship
Clinicians define a sexless marriage as having sex fewer than 10 times per year, or less than once a month. That’s a research threshold, not a diagnosis. Plenty of couples fall below that line and feel perfectly content, while others have sex weekly and feel disconnected. The label is most useful when one or both partners feel distressed about the gap between what they want and what’s happening.
How Parenthood Changes Things
Having kids reshapes a couple’s sex life more than almost any other factor. In one survey, 85% of parents said they had sex more frequently before having children. Before kids, 54% of couples were having sex two to three times per week, and another 15% were having sex more than three times a week. After kids, the ceiling dropped to about three times per week at most, with many couples falling well below that.
The reasons are straightforward: exhaustion, less privacy, and the mental load of caregiving leave little energy or opportunity. Physical recovery from pregnancy and childbirth also plays a role, especially in the first year. There’s no standard timeline for bouncing back to pre-baby frequency, and many couples settle into a new normal that looks different from what came before.
What Drives Frequency Up or Down
Several factors pull sexual frequency in different directions, and most of them have nothing to do with attraction or the quality of your relationship.
- Health and medications: Hormonal changes during menstruation, pregnancy, and menopause directly affect sex drive. Low testosterone in men does the same. Antidepressants are one of the most common libido-lowering medications, affecting both men and women.
- Relationship length: Novelty fades. Couples who’ve been together for years often experience a natural dip in frequency as the relationship becomes more routine. This isn’t a sign of trouble on its own, but it does mean couples benefit from openly discussing what they each need.
- Daily life stress: Work demands, household responsibilities, and the general pace of life leave people tired and mentally preoccupied. When your brain is running through tomorrow’s to-do list, desire takes a back seat.
Sexual Frequency and Physical Health
Regular sexual activity appears to carry real health benefits beyond the relationship. A large analysis using data from the National Health and Nutrition Examination Survey, which included over 4,500 participants with high blood pressure, found that those who had sex 12 to 51 times per year (roughly once a week to once a month) had lower risks of dying from any cause compared to those who had sex fewer than 12 times per year. People who had sex more than 51 times a year saw even lower risk.
The cardiovascular benefits are the most studied. Sex raises your heart rate, improves circulation, and triggers the release of hormones that reduce stress. That said, the relationship between sex and health runs in both directions: healthier people tend to have more sex, and more sex may contribute to better health. Both things are probably true at once.
When the Number Actually Matters
The most useful way to think about sexual frequency isn’t by comparing yourself to an average. It’s by looking at the gap between what you and your partner each want. A couple having sex twice a month who are both satisfied is in better shape than a couple having sex twice a week where one partner feels pressured and the other feels rejected. The research on forced increases in frequency makes this point clearly: more sex that doesn’t come from genuine mutual desire doesn’t improve anything.
If there’s a mismatch, the conversation matters more than the number. Couples who talk openly about desire, timing, and what feels good tend to find a rhythm that works, even when life gets in the way. The “right” amount of sex is whatever leaves both people feeling connected and wanted.