Whoa there! Do you mean is it medically safe to have intercourse while on your period? Then the answer is yes. You nor your partner will suffer any physical harm, it's just pretty messy. If however you were asking if it is safe to have unprotected sex while on your period, it's not such a good idea. You CAN get pregnant, even on your period, and you CAN get an STD. Please protect yourself. Always.