Research consistently points to once a week as the frequency where couples report the highest relationship satisfaction. A large study published in Social Psychological and Personality Science found that happiness increased as couples had more sex up to about once a week, but beyond that, the benefits plateaued. More wasn’t better.
That said, “should” is doing a lot of heavy lifting in this question. The real answer depends on your age, your relationship stage, your health, and what actually feels good for both of you. Here’s what the data shows and how to make sense of it.
The Once-a-Week Finding
The most cited research on this topic comes from psychologist Amy Muise and colleagues, who analyzed data from over 30,000 people across three studies. They found that for couples, relationship satisfaction increased with sexual frequency up to once a week, with no noticeable benefit beyond that. For people having sex about six times a month or fewer, each additional encounter was linked to meaningfully higher satisfaction. For those already having sex more than once a week, the association disappeared entirely.
The key mechanism was the relationship itself. Relationship satisfaction accounted for 95% of the connection between sexual frequency and overall life satisfaction. In other words, sex makes people happier primarily because it strengthens the relationship, not because of the physical act alone. Once you’re connecting regularly enough to maintain that bond, additional frequency doesn’t move the needle much.
What “Average” Actually Looks Like
If you feel like you’re having less sex than everyone else, you’re probably overestimating what everyone else is doing. In 1990, 55% of adults ages 18 to 64 reported having sex weekly. By 2024, that number had dropped to just 37%. Even among married adults, weekly sex fell from 59% (between 1996 and 2008) to 49% (between 2010 and 2024). The cultural assumption that most couples are having sex multiple times a week doesn’t match reality.
A 2020 survey broke frequency down by age. Among adults 25 to 34, about half of men and 54% of women reported sex at least once a week. The numbers held remarkably steady through the 35-to-44 range. For adults 18 to 24, the rates were actually lower, with 37% of men and 52% of women hitting the once-a-week mark. Among adults 50 to 64, about 75% remain sexually active, though the frequency tends to shift toward once or twice a month rather than weekly.
Why Frequency Drops Over Time
Almost every long-term couple experiences a decline in sexual frequency, and the drop happens earlier than most people expect. German panel data tracking couples over time found that the steepest decline occurs in the first few years of a relationship, not after decades together. Neither moving in together nor getting married significantly changed the trajectory. The initial passion-driven frequency simply settles into a lower, more stable pattern.
This is normal biology, not a sign of a failing relationship. The neurochemical cocktail that drives new-relationship desire is inherently temporary. What replaces it, for many couples, is a different kind of desire that responds to context, emotional closeness, and intentional effort rather than the automatic pull of novelty.
Quality Matters More Than Frequency
Fixating on a number can backfire. Couples who feel pressured to hit a frequency target often report less satisfaction, not more. The research consistently shows that how connected you feel during sex predicts relationship happiness far better than how often you do it.
The physical benefits of regular sex are real: lower blood pressure, better immune function, improved sleep, natural pain relief, and reduced stress. But these benefits come from enjoyable sexual experiences, not from checking a box on a calendar. If you’re having sex once a month and both partners feel genuinely satisfied, that’s a perfectly healthy frequency.
When You and Your Partner Want Different Things
Mismatched desire is one of the most common issues couples face, and therapists at the Gottman Institute frame it as a “perpetual problem,” meaning it’s not something you solve once and move on from. It’s something you manage through ongoing understanding and compromise.
One helpful concept is the difference between spontaneous and responsive desire. Spontaneous desire is the kind that seems to appear out of nowhere: you’re suddenly in the mood. Responsive desire works differently. You weren’t thinking about sex, your partner initiates, and once physical contact begins, arousal builds and you think, “Why don’t we do this more often?” Neither type is better or more valid, but many couples run into trouble when one partner experiences mostly responsive desire and interprets that as low desire. It’s not. It just needs a different starting point.
Therapists also use what’s called the dual control model, which frames desire as a balance between accelerators and brakes. Stress, resentment, exhaustion, body image concerns, and unresolved conflict all press the brakes. Feeling emotionally connected, having uninterrupted time, and physical affection throughout the day press the accelerator. The most effective approach is to identify and remove the brakes first, rather than trying to press harder on the gas.
The Case for Scheduling Intimacy
Scheduling sex sounds unsexy, but the data tells a different story. Couples who schedule intimacy report a 50% reduction in feelings of pressure and disappointment around their sex lives. The reason is counterintuitive: removing the guesswork about when sex will happen actually lowers anxiety for both partners. The person with higher desire stops feeling rejected by constant uncertainty. The person with lower desire stops feeling ambushed or guilty.
Scheduling also gives both partners time to mentally prepare, which is especially important for people with responsive desire. Anticipation can become part of the experience rather than a barrier to it. Think of it less like a doctor’s appointment and more like a dinner reservation: you’re setting aside protected time for something you both value.
Finding Your Own Number
The once-a-week finding is a useful benchmark, not a prescription. Some couples thrive at two or three times a week. Others are genuinely happy at twice a month. The frequency that works for you depends on your life stage, your health, how young your kids are, your work schedules, and dozens of other factors that shift over time.
What the research really tells us is this: regular sexual connection matters for relationship health, but “regular” is flexible. If both partners feel satisfied and connected, you’re at the right number. If one or both of you feels disconnected, the conversation to have isn’t about frequency. It’s about what’s pressing the brakes, what would make intimacy feel appealing again, and what each of you actually needs to feel close.