Sex burns roughly 250 calories per hour for men and 190 calories per hour for women, based on per-minute rates from the most widely cited study on the topic. In practice, though, most sexual encounters last far less than an hour, so the actual calorie totals per session are considerably lower. A 2013 study published in PLOS ONE tracked 21 young couples during sexual activity and found men burned an average of 101 calories per session while women burned about 69, with sessions averaging around 25 minutes.
What the Per-Minute Numbers Look Like
The PLOS ONE study measured men burning about 4.2 calories per minute and women burning about 3.1 calories per minute during sex. Those are averages with a wide range. Some men burned as few as 3 calories per minute while others exceeded 5. Women showed a similar spread. If you could sustain that level of effort for a full 60 minutes, you’d land somewhere between 186 and 252 calories depending on your sex. For context, that puts vigorous sex roughly on par with a brisk walk and below a light jog in terms of energy expenditure.
These figures represent gross calories, meaning they include what your body would have burned anyway just sitting on the couch. To get the true “extra” calories from the activity itself, you’d subtract your resting burn rate, which is roughly 1 to 1.5 calories per minute for most people. That brings the net calorie cost of sex down to about 2 to 3 extra calories per minute for men and 1.5 to 2 for women.
How Intensity Changes the Numbers
Not all sex burns the same number of calories. The Compendium of Physical Activities, a standardized reference used in exercise science, assigns three different intensity levels to sexual activity. Vigorous, active sex scores a 5.8 MET value, which is comparable to singles tennis or moderate cycling. General sex at moderate effort scores 3.0 METs, similar to a casual walk. Passive activity like kissing and light contact scores just 1.8 METs, barely above resting.
That 5.8-to-1.8 range means the difference between an active and passive partner can be dramatic. Being on top in a missionary or straddling position uses noticeably more energy than lying on the bottom. Standing positions burn roughly 10% more calories than lying down or sitting, based on general metabolic research. And the faster and more physically demanding the movement, the more energy your body requires, though the effect is modest compared to simply extending the duration.
Why Men Burn More Than Women
The calorie gap between men and women during sex mirrors a broader physiological pattern. Men carry more lean muscle mass and less body fat at every age compared to women. Muscle tissue is metabolically expensive, meaning it demands more energy to move and maintain. So for the same activity at the same intensity, a larger, more muscular body burns more fuel. This isn’t unique to sex. Men burn more calories than women walking, swimming, or doing virtually any physical task, and the difference is almost entirely explained by body composition rather than effort.
How Sex Compares to Other Exercise
At 4.2 calories per minute for men, sex sits between a leisurely walk (about 3.5 calories per minute) and a light jog (about 7 to 8 calories per minute). It burns more than yoga or stretching but less than cycling, swimming laps, or any sustained cardio workout. The catch is duration. A typical jog might last 30 to 45 minutes, while the average sexual encounter in the PLOS ONE study lasted about 25 minutes, and other surveys put the median even shorter.
Heart rate during sex tells a similar story. Men’s heart rates rarely climb above 130 beats per minute during intercourse, according to Harvard Health Publishing. That’s a moderate cardiovascular effort, roughly what you’d hit during a fast walk or an easy bike ride. It’s enough to get your blood moving but well short of the 150-plus range that comes with running or vigorous sports.
What Actually Determines Your Total Burn
Four factors matter most: duration, intensity, body weight, and how active your role is.
- Duration is the biggest lever. Doubling the length of a session roughly doubles the calories burned. A 15-minute encounter might burn 50 to 65 calories, while a 45-minute session could reach 140 to 190.
- Body weight scales the burn proportionally. A 200-pound person burns more calories doing anything than a 130-pound person, because it takes more energy to move more mass.
- Active vs. passive role matters significantly. The partner doing more physical work, thrusting, supporting their weight, or changing positions, burns substantially more than a partner who is relatively still.
- Positions and variety contribute in smaller ways. Positions that engage your core, arms, or legs more heavily demand more energy. Switching positions throughout a session keeps more muscle groups involved.
The wide standard deviation in the research makes this worth emphasizing. In the PLOS ONE data, men’s calorie totals ranged from about 50 to over 150 calories per session. The “average” number is just the midpoint of a broad spread that depends heavily on what you’re actually doing and for how long.
The Bottom Line on Sex as Exercise
Sex is a real physical activity that burns real calories, but it’s a moderate one. At roughly 3 to 5 calories per minute depending on your sex and effort level, it falls in the range of light to moderate exercise. Projected over a full hour, that’s 180 to 300 calories, though very few encounters last that long. For most people, a single session burns somewhere between 50 and 100 calories. It’s a pleasant supplement to an active lifestyle, but it won’t replace your regular workout.