• Having sex a few times a week can boost your immune system. • Sex can cure a headache by releasing endorphins. • During sexual intercourse, a man’s heartbeat rarely gets above 130 beats a minute. • During sex, a man will consume about the same amount of oxygen as dancing, raking leaves or playing table tennis. • Men who have three or more orgasms a week have a 50 per cent lower death rate than those who ejaculated less frequently.