There is no specific clinical definition of how long sex life between couples is normal, and the time of sex life varies mainly according to the differences between individuals. The time of sexual life is mainly to both sides can achieve sexual satisfaction, and orgasm, is a high quality sex life, normal sex life, so not every couple must reach ten minutes or twenty minutes between normal, mainly according to their own feelings, if you can reach orgasm, and both sides are satisfied with the case is normal. In addition, with the growth of age, sex time will be shortened, mainly with physical strength has a certain relationship, such as 20-year-olds and 60-year-olds, sex time is certainly different, 60-year-olds may live a relatively shortened time.