How many days after menstruation ends is it safe to have intercourse without harming the body?

It is generally safe to resume sexual intercourse three to four days after menstruation has completely ended, as it should not cause harm to the body. However, if there is abdominal pain, inflammation, or any other noticeable discomfort, intercourse should be avoided, as areas such as the cervix may not have fully recovered. Engaging in sex at this time could potentially cause significant harm to the body.

Right after menstruation ends, the cervical opening has not yet fully closed. Having sex too early may allow bacteria or viruses to travel upward into the pelvic cavity or cervix, leading to gynecological conditions such as vaginitis, cervicitis, or pelvic inflammatory disease, and resulting in adverse effects like lower abdominal pain. Immediately after a period, small amounts of blood may still remain in the uterine cavity; sexual activity could cause retrograde menstrual flow, which might trigger endometriosis.

To protect women's health, it is recommended to wait three to four days after the end of menstruation before resuming sexual activity, and sexual intercourse during menstruation should be strictly avoided. When resuming sex afterward, attention should be paid to genital hygiene, and the genital area should be cleaned promptly after intercourse to prevent creating an environment conducive to bacterial or microbial growth.