How many calories do you burn having sex? Many, many LESS than you imagine. There are people who say that having sex burns two or three hundred calories in an hour ( source ), and that the pinnacle of enjoyment alone burns one hundred to one hundred and fifty calories ( source ). Indeed, there have been articles on the topic applied to diets: have more sex to lose weight, et voilà the sex diet ( source ).
But apparently fantasies have far outstripped reality, and while being imaginative matters in bed, I’m sorry to hit you with the reality data, which comes from a recent study., British, which highlighted all the myths related to obesity and what it would make you fat or lose weight. One of these is precisely the following:

Is it true that by doing sexual activity you burn from 200 to 300 calories ???
According to the study, published in The New England Journal of Medecine , a man of around 70 pounds and in his 30s can burn a maximum of 210 calories in one hour of continuous sexual activity (and men, being more active during intercourse, burn more than women). We apply the same thing to men who are no longer young and not of normal weight, who will probably burn even less, and let’s also remember that the so-called sexual activity, therefore net of foreplay, does not last more than six minutes as an average ( source ).
Doing a calculation, in 6 minutes of sexual activity a man in good shape burns about 21 calories, a woman much less: certainly a little more, according to the researchers, of a sedentary activity, but in short, they are certainly not large numbers.