Experiencing stomach cramps after sex is fairly common among women, many women although it can sometimes create feelings of worry or discomfort. The occasional mild cramping during sex does not usually indicate a serious medical problem but persistent or severe pain may signal an underlying condition that needs medical evaluation. The pelvic area muscle contractions that occur during orgasm lead to short-term discomfort in most cases. Stomach cramps following intercourse can be caused by gas accumulation and bloating and digestive system problems. The uterus and ovaries become sensitive during certain times of the menstrual cycle which leads to pain during or after sexual activity.