Yup - Exercise and Sex. No, they are not the same thing. Hillwalking can give you regular aerobic exercise, as well as a rewarding packed lunch and a pretty view. About 40 minutes a day can add as much as 12 years to a person's life. But having great sex is more challenging.
Sex is a chemical thing.
It releases beta-endorphins in the brain, natural painkillers, and human growth hormone. When it culminates in orgasm, the body feels good, setting in motion further physical responses. Like a number of other stimulating sensations, sex releases a group of substances in the brain, among them the beta-endorphins, natural painkillers that can also alleviate anxiety. The authors claim that vigorous sexual intercourse exercise triggers a small release of human growth hormone. This can reduce fatty tissue and increase lean muscle in various parts of the body, giving a more youthful appearance.