There are more reasons for occasional small amounts of bleeding during intercourse between men and women, which may be caused by ovulation, too rough movements, cervical lesions, etc. 1. Ovulation: men and women cohabit just in the ovulation period, after ovulation in the body of estrogen level transient decline, the endometrium to lose the support of estrogen may have a small amount of stripping and cause bleeding, cohabit may have a small amount of vaginal bleeding. 2. Action too rough: men and women in the same room action too rough, may cause vaginal mucosal damage, damage will have a small amount of bleeding. 3. Cervical lesions: women suffering from cervical polyps, cervical cancer and other diseases may have contact vaginal bleeding after sex, which may also be manifested as occasional small amount of bleeding during intercourse. There are many reasons why men and women occasionally bleed a little during intercourse, so it is recommended to consult a doctor in time, complete the relevant examinations, clarify the causes under the guidance of a professional doctor, and target treatment.