Most married couples have sex about three times per month, based on the median from a 2019 study of cohabiting and married adults. That said, there’s a wide range of normal. Survey data from 2016 to 2018 found that roughly 58% of married men and 61% of married women reported having sex weekly or more, while about a third of couples landed in the one-to-three-times-per-month range. A small percentage, under 2%, reported no sexual activity at all.
What the Numbers Look Like by Age
Sexual frequency holds relatively steady through early and middle adulthood. Among adults 25 to 44, about half of men and just over half of women report having sex at least once a week. The numbers are slightly lower for the youngest adults (18 to 24), where 37% of men and 52% of women hit that weekly mark, likely reflecting that fewer in this group are in established relationships.
The sharpest drop shows up in the 50s. A long-running survey spanning 1989 to 2014 found that people in their 50s experienced the biggest decline in sexual frequency of any age group. Still, sex doesn’t disappear in later life. A study from Ireland found that 75% of people ages 50 to 64 remained sexually active, and about 23% of those 75 and older were as well.
The Steepest Drop Happens Early
If you feel like the frequency dropped fast in your first year or two of marriage, that’s not unusual. Research has shown that the most dramatic decline in sexual frequency happens within the first year of marriage, not decades later. After that initial dip, frequency continues to decrease gradually over time, driven by both age and the length of the relationship. The slow decline over years is normal and expected. It’s the early, sharper adjustment that catches many couples off guard.
Married Couples Are Having Less Sex Than Before
This isn’t just about individual relationships cooling off. There’s a broader cultural shift happening. Among married men ages 18 to 44, the share reporting weekly or more frequent sex dropped from 71% in 2000 to 58% in 2018. Married women saw a smaller but real decline over the same period, from 69% to 61%.
Zooming out further, U.S. adults overall were having sex about nine fewer times per year in the early 2010s compared to the late 1990s. Researchers haven’t pinpointed a single cause, but the trend is consistent across multiple surveys and age groups. Younger generations appear to be entering adulthood with less sexual activity than previous ones: 15% of those born in the early 1990s reported sexual inactivity in their early 20s, compared to about 12% of those born a decade earlier.
How Parenthood Changes Things
Having a baby reliably decreases how often couples have sex. Research confirms that sexual frequency drops at the transition to parenthood, and couples don’t always compensate with other forms of physical intimacy. The combination of sleep deprivation, physical recovery (especially after birth), shifting roles, and the sheer logistics of caring for a newborn leaves less time and energy for sex. For most couples, this is a temporary valley rather than a permanent new baseline, but the recovery timeline varies widely.
Once a Week Seems to Be the Sweet Spot
If you’re wondering whether more sex always means a happier relationship, the answer is: only up to a point. A study of male-female couples found that the vast majority of highly satisfied couples, about 86%, fell into a profile where both partners were happy and having sex just under once a week. Beyond that frequency, additional sex didn’t keep pushing satisfaction higher. The takeaway isn’t that once a week is a magic number, but that quality and mutual satisfaction matter more than hitting a particular count.
What Counts as a “Sexless” Marriage
The commonly used threshold is fewer than 10 times per year. By that definition, about 20% of American marriages qualify as sexless. That’s a significant number, and it’s worth noting that “sexless” doesn’t automatically mean unhappy. Some couples are perfectly content with very low frequency, while others at the same number feel deeply disconnected. The gap between what each partner wants tends to matter more than the raw number.
Why Frequency Matters for Health
Regular sexual activity does more than strengthen a relationship. During arousal and orgasm, your body releases oxytocin, a hormone that has calming, anti-stress, and anti-inflammatory effects. It also increases interpersonal trust and can raise your pain threshold, particularly in women.
There are cardiovascular benefits, too. Sex acts as moderate exercise: heart rate rises by 20 to 80 beats per minute during orgasm, and blood pressure increases temporarily. One study comparing sexual activity to treadmill testing in cardiology patients found that while sex lasted nearly three times longer than the treadmill session, the cardiac workload was about half as intense. For older men, having partnered sex at least once a month was associated with lower levels of a key inflammation marker tied to heart disease.
The immune system gets a boost as well. College students who had sex once or twice a week showed levels of a common antibody (the kind that protects mucous membranes) that were 30% higher than students who were abstinent. And for migraine sufferers, 60% reported their migraine improved during sexual activity, with most of those experiencing moderate to complete relief.