1. The harm of menstrual sex 1.1. At this time, sexual intercourse will increase the chance of endometritis, acute adnexitis and pelvic peritonitis, because women are in a sensitive period during menstruation, physical fitness is relatively poor, menstrual blood can provide a good growth environment for bacteria, sexual intercourse at this time, pathogens brought to the vagina and uterus position, women will have fever or severe pain in the lower abdomen after sexual intercourse. 1.2. Immune infertility may occur. Because of menstrual intercourse, it may be that male sperm enter the woman's bloodstream at the site of uterine damage, causing the female immune system to produce anti-sperm antibodies, resulting in infertility. 2.3 moments that are least suitable for sexual intercourse 2.1. Do not have sex when there is no sexual desire Harmonious sex life should be carried out in the case of sexual requirements on both sides, if for various reasons, one party has no sexual desire, the...