The frequency of sexual life is not clinically defined by an accurate value, three times a day is normal or once a day is normal, mainly because individual differences and the frequency of sexual life is different. The vast majority of newlywed couples may have two or three times a day sex is normal, with the passage of time, with the growth of age, the frequency of sex will appear gradually declining trend. The older you are, the longer the interval between the frequency of sex will be in the clinical are normal, for example, 20-year-old couples may have sex 3-5 times a week is normal. If to 50 years old sex life frequency will decline, may be half a month will have a or a month have a normal. Couples how long sex has a time, mainly to both sides can reach orgasm, and do not feel fatigue is the normal situation.