Usually, you can have intercourse 2-3 days after the end of menstruation. Since the end of menstruation is just over, the endometrium is not completely closed, so premature intercourse can cause infection and other adverse effects. The endometrium does not recover well during menstruation, so intercourse can stimulate the return of menstruation, resulting in vaginal bleeding. The bleeding environment in the vagina cannot resist the invasion of bacteria, which can easily lead to vaginitis, endometritis, adnexitis and even pelvic inflammatory disease, which may affect pregnancy in serious cases. In contrast, 2-3 days after menstruation, the endometrium recovers to a certain thickness, and this period belongs to the follicular phase, not in the ovulation phase, which is easy to get pregnant, so it is safer to have intercourse. Both partners need to pay attention to hygiene during intercourse. Although it is not easy to get pregnant during this time, it is still recommended to take reliable contraceptive methods, including taking short-acting contraceptive pills and wearing condoms, etc. You should not take any chances.