Sex burns roughly 3.6 calories per minute on average. Men tend to burn more, around 4.2 calories per minute, while women burn about 3.1 calories per minute. Those numbers come from a study at the University of Quebec at Montreal that fitted 21 young couples with portable sensors and tracked their energy expenditure from foreplay through orgasm.
What the Research Actually Measured
The Quebec study is the most widely cited lab measurement of calories burned during sex. Participants wore armband sensors that tracked heat output, skin temperature, and movement while they had sex at home. The sessions included foreplay, intercourse, and at least one orgasm. On average, men burned about 101 calories per session and women burned about 69 calories. The intensity registered at roughly 5.8 METs, a standard unit that compares any activity to sitting still. That puts sex in the “moderate intensity” category, similar to brisk walking uphill or doubles tennis.
An earlier lab study from 1984 had couples wired up to heart monitors and oxygen analyzers in a clinical setting. It found lower intensity levels of 3 to 4 METs, likely because the laboratory environment made for less vigorous sessions. The Quebec researchers noted this gap and attributed their higher readings to the fact that couples were in their own homes and could behave naturally.
How Sex Compares to Exercise
At 3.6 calories per minute, sex falls well short of a proper workout. Jogging at a moderate pace burns roughly 8 to 12 calories per minute depending on your weight. Cycling burns 6 to 10. Even a brisk walk typically hits 4 to 5 calories per minute, which is in the same ballpark as sex and lasts much longer.
The real limitation is duration. Most sexual encounters, including foreplay, last somewhere around 15 to 25 minutes. A 25-minute session at 3.6 calories per minute adds up to about 90 calories, roughly the equivalent of walking a mile. That’s not nothing, but it won’t replace your morning run.
Why Men Burn More
The calorie gap between men and women has two main drivers. First, men in the study were heavier on average, and larger bodies burn more energy during any physical activity. Second, men tended to be more physically active during intercourse, particularly in the most common position studied. The 1984 study specifically noted that the man-on-top position produced the highest energy expenditure, since the person on top is doing most of the supporting and thrusting work. Position matters: whoever is more physically active during a session will burn more calories regardless of sex.
What Affects Your Personal Burn Rate
The 3.6 calories per minute figure is an average across young, healthy participants in their early twenties. Several factors shift your individual number up or down.
- Body weight: Heavier people burn more calories during any movement. The same session that burns 100 calories for a 170-pound person might burn 130 for someone at 220 pounds.
- Intensity and effort: A slow, relaxed encounter burns fewer calories than a vigorous one. The Quebec study found that some individual sessions hit 6 METs or higher, while others barely registered.
- Duration: Longer sessions obviously mean more total calories. A 10-minute encounter and a 30-minute encounter are very different workouts.
- Position and role: The more active partner, typically the one on top or doing most of the movement, burns significantly more than the less active partner.
What Happens to Your Heart Rate
During foreplay, your heart rate and blood pressure climb gently. The biggest spike happens during orgasm, a burst lasting only 10 to 15 seconds where your cardiovascular system hits its peak. In healthy people, heart rate rarely tops 130 beats per minute and blood pressure rarely exceeds 170 systolic, both of which return to normal quickly afterward. For context, moderate jogging typically pushes your heart rate to 140 to 160 bpm and sustains it there for the entire run. Sex produces brief cardiovascular peaks but doesn’t maintain an elevated heart rate long enough to deliver serious aerobic training benefits.
The American Heart Association classifies sexual activity as equivalent to 3 to 5 METs of physical effort, putting it in the same range as climbing two flights of stairs or walking at 3 to 4 miles per hour. It’s real physical activity, just not intense or sustained enough to count as a workout on its own.
The Bottom Line on Calories
Sex burns about 3 to 4 calories per minute, with a typical session totaling 70 to 100 calories. That’s roughly equivalent to a 15-minute walk. It qualifies as moderate physical activity and does give your cardiovascular system a brief workout, but the total energy expenditure is modest because sessions are short and intensity fluctuates. If you’re looking for calorie burn, exercise is far more efficient. If you’re just curious, now you have the number.