Sex after menstruation may cause the occurrence of female inflammation, the most common is the occurrence of female pelvic inflammatory disease and pelvic infection. During menstruation, a woman’s body resistance is relatively poor, and if a woman has intercourse, the man may bring pathogens into the woman’s body. The cervical opening is slightly open during menstruation, and this state of affairs may lead to upward infection of pathogenic bacteria causing pelvic inflammation and pelvic infection, so it is not recommended that women have sex during menstruation. If a woman has intercourse during menstruation, in this case, we must pay attention to the cleanliness and hygiene of the vulva, change underwear and underpants, do not wear tight clothing and chemical fiber clothing, prohibit the consumption of spicy, stimulating food, pay attention to rest, avoid strenuous exercise.