What are the harms of having sex during menstruation to women?

I believe most women know that they should not have sex during menstruation, but sometimes they can't resist their boyfriends or husbands' nagging and will agree to their request. In fact, having sex during menstruation will cause great harm to women's health, so they must be careful to avoid it.

1. Heavy menstrual bleeding and prolonged menstrual period

Because both parties are excited, the entry of the penis will cause the female genitals to become congested, leading to increased menstrual volume and prolonged menstrual period.

2. Endometrial infection

If having sex at this time, the male reproductive organ may bring bacteria into the vagina. Menstrual blood is a good culture medium for bacteria and other microorganisms. Bacteria can easily breed and spread along the many tiny wounds and ruptured blood vessels in the endometrium, infecting the endometrium and even affecting the fallopian tubes and pelvic organs, thus causing unnecessary trouble to the woman.

3. Causes male urethritis

If you have sex during menstruation, the female menstrual secretions will enter the male urethra, causing male urethritis.

4. Cause infertility

Having sex during menstruation may cause sperm to meet the damaged endometrium and overflowing blood cells, and even enter the blood, which may induce the production of anti-sperm antibodies, leading to immune infertility and sterility. Having sex during menstruation can cause the uterus to contract during sexual intercourse, which can squeeze endometrial fragments into the pelvic cavity, causing endometriosis and leading to infertility.