Most couples in relationships have sex about once a week. That’s the short answer, but the more useful one is this: “normal” spans a wide range, and the number that matters most is whether both partners feel satisfied. Among the 30,000-plus people studied in a landmark analysis published in Social Psychological and Personality Science, relationship happiness increased with sexual frequency up to about once a week, then plateaued. More sex than that didn’t make couples any happier.
Average Frequency by the Numbers
Married adults in the United States have sex roughly 56 times per year, which works out to just over once a week. That figure comes from data collected between 2010 and 2014, and it’s actually a drop from the late 1990s, when married couples averaged about 67 times per year. Unmarried adults report a similar frequency, around 51 times per year.
A 2020 study of more than 9,500 people found that about half of adults between 25 and 44 have sex at least once a week. The numbers are fairly consistent across that age range: 50% of men and 54% of women aged 25 to 34 reported weekly sex, while 50% of men and 53% of women aged 35 to 44 said the same. Younger adults (18 to 24) actually reported slightly lower rates for men, with 37% having sex weekly, possibly reflecting the fact that fewer people in that age group are in established relationships.
How Age and Hormones Play a Role
Testosterone begins a slow, steady decline around age 35, dropping roughly 1% per year. For some men, this gradually affects desire, though the relationship between hormone levels and sex drive is less straightforward than you might expect. Some men with clinically low testosterone report perfectly normal desire, while others with higher levels experience problems. The connection is real but highly individual.
For women, the picture shifts around age 50. Dropping estrogen levels during the approach to menopause can reduce desire and cause physical changes like vaginal dryness that make sex less comfortable. At the same time, some women in this stage find their interest in sex actually increases, freed from concerns about pregnancy or the demands of raising young children. Both experiences are common.
The Biggest Factor: Relationship Length
If your sex life has slowed down since the early days of your relationship, you’re experiencing what researchers consistently find across studies: sexual frequency drops most steeply in the first few years of a relationship, then levels off. This pattern holds regardless of whether a couple is married or living together. The initial decline isn’t a sign of a failing relationship. It’s one of the most reliably documented patterns in research on couples.
The reasons aren’t fully understood, but they likely involve a mix of fading novelty, increasing comfort, competing demands on time and energy, and the natural settling of the intense neurochemical rush that characterizes new relationships. Couples who’ve been together a decade or more typically have sex less often than those in year one, but many report higher overall relationship satisfaction than they had early on.
Everyone Is Having Less Sex Than Before
If you feel like you’re having less sex than couples “used to,” you’re probably right. Between the late 1990s and the early 2010s, Americans were having sex about nine fewer times per year on average. The decline shows up across nearly every demographic group.
Between 2000 and 2018, the percentage of men aged 25 to 34 who reported having sex at least once a week dropped from 65% to 50%. Among married men specifically, weekly sex declined from 71% to 58%. Married women saw a similar slide, from 69% to 61%. Younger men (18 to 24) experienced the steepest percentage drop, falling from 52% to 37%.
The causes are debated, but researchers point to increased screen time, longer working hours, higher rates of living with parents among younger adults, rising anxiety and depression, and the general busyness of modern life. The decline predates the pandemic, so it reflects a longer cultural shift rather than a single disruption.
The Once-a-Week Happiness Threshold
The most practical finding from the research is this: couples who have sex once a week report significantly higher well-being than those who have sex less than once a month. The boost in happiness from moving between those two frequencies is large. In one analysis, it was more than twice the well-being difference associated with earning $50,000 to $75,000 per year compared to $15,000 to $25,000.
But here’s the key part: going beyond once a week didn’t add any additional happiness. Couples having sex three or four times a week were no more satisfied with their lives than those doing it once. This held true across a combined sample of more than 30,000 people. The takeaway isn’t that you should aim for exactly once a week. It’s that chasing a higher number for its own sake doesn’t translate into a better relationship.
When Frequency Drops Very Low
Researchers generally define a sexless relationship as one involving sexual intimacy fewer than ten times a year. By that measure, about 20% of American marriages qualify. That’s a significant number, and it means that if you’re in a relationship with very little sex, you’re far from alone.
A low-sex or no-sex relationship isn’t automatically a problem. Some couples are perfectly content with minimal physical intimacy. It becomes an issue when one or both partners feel dissatisfied, disconnected, or resentful about the mismatch. The frequency itself is less important than whether both people feel it’s working for them.
What Actually Matters More Than a Number
Comparing your sex life to an average is natural, but the research consistently points in the same direction: sexual satisfaction depends more on quality, communication, and mutual desire than on hitting a specific number. Couples who talk openly about what they want, who prioritize physical affection even outside of sex, and who address mismatches in desire without blame tend to report higher satisfaction regardless of how often they’re actually having sex.
If you and your partner are both happy with your frequency, whether that’s five times a week or twice a month, that’s your normal. If there’s a gap between what one partner wants and what’s happening, the frequency itself isn’t the problem to solve. The conversation is.