Generally speaking, the time interval between couples need to be determined according to the couple’s age and physical fitness and other factors, generally 2 to 3 days of coitus is a normal phenomenon. Usually if the couple is young, physical fitness is better, the number of coitus will be relatively more, such as two days 1 time, if the couple is older, physical strength is limited, need to appropriately reduce the number of coitus, can be 3 days or so once. If the elderly may be once a month is the normal situation. But no matter how many days of coitus once, coitus after the 2nd day if the body feels extremely tired, we must pay attention to the conditions, coitus room interval days should be extended appropriately. Both husband and wife in the same room must remain relaxed, but also to keep the environment clean and hygienic, so as to avoid the occurrence of inflammation, women who are in the menstrual period or suffering from gynecological inflammation, to temporarily avoid having sex, so as not to have an impact on the health of the body.