An hour of sex burns roughly 100 to 250 calories, depending on your body weight, intensity, and how active your role is. Men tend to burn more than women during sex, averaging about 4.2 calories per minute compared to 3.1 calories per minute for women. That puts a full 60 minutes of sexual activity somewhere around 250 calories for men and 185 for women, though the reality is more nuanced than a simple multiplication.
What the Research Actually Measured
The most cited study on this topic, published in PLOS ONE, strapped heart rate monitors and armband sensors onto 21 young couples and tracked their energy expenditure during sex. Men burned an average of 101 calories per session while women burned about 69 calories. But those sessions averaged around 25 minutes, not a full hour. The per-minute rates of 4.2 calories for men and 3.1 for women are the more useful numbers if you want to scale up to longer durations.
Here’s where expectations collide with reality: most sexual encounters don’t last anywhere close to an hour. Vaginal intercourse typically lasts three to seven minutes, with sex therapists considering 7 to 13 minutes “desirable” and anything over 30 minutes “too long.” So while an hour of continuous sex would burn a meaningful number of calories, most people aren’t sustaining that kind of session. A more realistic encounter burns somewhere between 70 and 100 calories total.
How Sex Compares to Other Exercise
The American Heart Association classifies sex as mild to moderate physical activity, in the range of 3 to 5 METs (a standard measure of exercise intensity). That’s comparable to climbing two flights of stairs, walking briskly, raking leaves, or playing ping pong. Harvard Health Publishing puts it at about 3.5 METs for the average person, noting that a man’s heart rate rarely exceeds 130 beats per minute during intercourse.
For perspective, sex burns about five calories per minute at a vigorous pace. That’s four more calories per minute than watching television, but it’s roughly the same as walking a golf course. Moderate jogging burns significantly more. In the PLOS ONE study, the same participants who burned 4.2 calories per minute during sex burned considerably more on a treadmill, and they rated the treadmill a 4.6 out of 5 for intensity compared to just 2.7 for sex.
So sex is real physical activity, but it’s not a substitute for a workout. It sits comfortably in the “light cardio” category for most people.
Why Men Burn More Than Women
The calorie gap between men and women during sex comes down to two factors: body composition and physical role. Men carry more lean muscle mass on average, and muscle tissue burns more energy than fat tissue, both at rest and during activity. Women’s bodies are also more energy-efficient overall. They burn a higher proportion of fat relative to glucose during physical activity, and they conserve energy more readily, which is one reason women typically need to cut calories by a greater proportion than men to achieve the same weight loss.
Physical positioning matters too. The more active partner, whoever is doing more of the physical work, will burn more calories regardless of sex. The Compendium of Physical Activities, a database researchers use to classify energy costs, assigns a MET value of 5.8 to “active, vigorous” sexual activity, 3.0 to “moderate effort,” and just 1.8 to “passive, light effort” like kissing and hugging. That means the difference between an active and passive role can nearly triple your caloric burn.
What Changes Your Calorie Burn
Several factors push the number higher or lower:
- Body weight: A heavier person burns more calories performing the same activity. The MET-based formula multiplies intensity by body weight, so someone weighing 200 pounds burns roughly 33% more than someone at 150 pounds during identical activity.
- Intensity and position: Vigorous, physically demanding positions where you’re supporting your body weight or thrusting actively push you toward that 5.8 MET range. Lying passively drops you closer to 1.8 METs, barely above resting.
- Duration: This is the biggest variable. A 10-minute encounter at moderate intensity might burn 30 to 40 calories. A genuinely active 60-minute session could reach 200 or more.
- Fitness level: People with higher cardiovascular fitness tend to have lower heart rates during the same activity, which can mean slightly fewer calories burned. However, fitter people can also sustain higher intensity for longer, which works in the other direction.
Realistic Calorie Estimates by Duration
Using the per-minute averages from the research, here’s what a moderately active session looks like for a person of average weight:
- 15 minutes: roughly 45 to 65 calories
- 30 minutes: roughly 90 to 125 calories
- 45 minutes: roughly 140 to 190 calories
- 60 minutes: roughly 185 to 250 calories
The lower end of each range reflects women’s average burn rate, while the higher end reflects men’s. Vigorous activity could push these numbers 30 to 50% higher, while a more relaxed pace would pull them lower. Keep in mind that a full hour of sustained, physically active sex is uncommon. Most sessions include periods of varying intensity, with some moments closer to resting and others more demanding. The calorie count for a typical real-world encounter falls well below these per-hour projections.