Does having sex during menstruation lead to infertility?

Patient's question:

Condition Description (Main Symptoms, Onset Time): Has not been pregnant

Doctor's answer:

Hello, sexual intercourse is prohibited during menstruation because the endometrium forms wounds during this period, and the immunity of various systems decreases, making it easy to lead to inflammatory infections such as endometritis, pelvic inflammatory disease, and adnexitis. Additionally, during female sexual arousal, uterine contractions may cause menstrual blood to flow back into the pelvic cavity, leading to endometrial implantation and resulting in endometriosis. Endometriosis may affect fertility, so sexual intercourse during menstruation should be avoided.