Improved sense of smell: After sex, production of the hormone prolactin surges. This in turn causes stem cells in the brain to develop new neurons in the brain’s olfactory bulb, its smell center.
Reduced risk of heart disease: That by having sex three or more times a week, men reduced their risk of heart attack or stroke by half.
Weight loss, overall fitness: Sex, if nothing else, is exercise. A vigorous bout burns some 200 calories.
Muscular contractions during intercourse work the pelvis, thighs, buttocks, arms, neck and thorax. Sex also boosts production of testosterone, which leads to stronger bones and muscles.
Reduced depression: Sexually active participants whose male partners did not use condoms were less subject to depression than those whose partners did.
Pain relief: Immediately before orgasm, levels of the hormone oxytocin surge to five times their normal level. This in turn releases endorphins, which alleviate the pain of everything from headache to arthritis to even migraine. In women, sex also prompts production of estrogen, which can reduce the pain of PMS.
Less frequent colds and flu: Individuals who have sex once or twice a week show 30 percent higher levels of an antibody called immunoglobulin A, which is known to boost the immune system.