Once a week is the frequency most consistently linked to higher relationship satisfaction and personal happiness. Beyond that, more sex doesn’t appear to make couples measurably happier. That said, there’s no universal number that works for everyone, and the average adult has sex less often than you might think.
The Once-a-Week Threshold
A large study published by the Society for Personality and Social Psychology found that couples reported increasing satisfaction as sexual frequency went up to once per week, but the benefits plateaued after that. Having sex two, three, or seven times a week didn’t produce noticeably greater happiness than once. As the lead researcher, Amy Muise, put it: “You don’t need to have sex every day as long as you’re maintaining that connection.”
This doesn’t mean once a week is a rule. It’s a statistical pattern across thousands of people. Some couples are perfectly happy with sex a few times a month, and others want it more often. The key finding is that pushing for more frequent sex solely because you think you “should” isn’t likely to improve your relationship.
What’s Actually Average
Most married or cohabiting couples have sex about three times per month, according to a 2019 analysis. That’s less than once a week, and it’s the median, meaning half of all couples fall below it. If you feel like you’re not having enough sex, you’re probably closer to normal than you realize.
A 2020 study of over 9,500 people broke things down by age. Among adults 25 to 44, roughly half of men and just over half of women reported having sex weekly or more. For younger adults aged 18 to 24, the numbers were actually lower: only 37% of men and 52% of women hit that weekly mark. That runs counter to the assumption that younger people are having the most sex.
In fact, sexual inactivity among young men has risen sharply. Between 2000 and 2018, the percentage of men aged 18 to 24 reporting no sexual activity in the past year jumped from about 19% to 31%. The reasons are complex, but shifts in dating culture, increased screen time, and economic pressures all play a role.
Why Frequency Drops Over Time
New relationships almost always involve more frequent sex. That early intensity is driven by novelty and the rush of bonding hormones your brain releases with a new partner. It’s not sustainable, and it’s not supposed to be.
As relationships settle into routines, sex typically becomes less frequent. The median of three times a month for cohabiting and married couples reflects this natural shift. The decline isn’t a sign something is wrong. It’s one of the most consistent patterns in relationship research. What matters more than raw frequency is whether both partners feel satisfied with how often they’re connecting physically.
Health Benefits of Regular Sex
Sex does more than feel good in the moment. It triggers the release of endorphins, oxytocin, and dopamine, a combination that lowers stress hormones, lifts mood, and deepens emotional closeness with your partner. Oxytocin in particular promotes feelings of relaxation and bonding that can last well beyond the act itself.
There are physical benefits too. Sex is moderate exercise that strengthens your heart, helps lower blood pressure, reduces stress, and improves sleep, according to Johns Hopkins Medicine. None of these benefits require a specific weekly quota. Even occasional sex provides them, and the mental health benefits of feeling connected to a partner may matter as much as the physical exertion.
What Actually Gets in the Way
If your frequency feels lower than you’d like, the culprits are usually practical rather than relational. Poor sleep is one of the strongest predictors. Research published in the Journal of Psychosomatic Research found that disturbed sleep was significantly associated with declines in sexual activity and desire among both men and women, even after accounting for stress, anxiety, and depression. In other words, sleep problems suppress your sex drive independently of everything else going on in your life.
Stress operates through a similar pathway. When your body is flooded with cortisol over long periods, sexual desire drops. Fatigue from work, caregiving, or health issues compounds the effect. For many couples, the barrier isn’t attraction or compatibility. It’s that by the end of the day, both people are exhausted.
Addressing sleep quality, managing stress, and creating time that isn’t consumed by responsibilities tend to do more for a couple’s sex life than setting a target number and trying to hit it.
Finding Your Own Number
The honest answer to “how many times should you have sex a week” is: whatever feels right to both you and your partner. The research points to once a week as a useful baseline for relationship satisfaction, but that’s an average across populations, not a prescription. Some weeks it’s three times, some weeks it’s zero, and neither scenario means anything is broken.
A more useful question than “how often” is “are we both satisfied?” If one partner consistently wants more or less, that’s worth a conversation. Sexual satisfaction tracks closely with relationship satisfaction, and the willingness to talk openly about what you both need matters far more than matching some external benchmark.