When your period crams slowly start to kick in the first things you reach for are a bottle of hot water and ibuprofen. Sex may be one of the last things on your mind during your periods. But before you cringe and step back from sex understand that having an orgasm can actually help relieve menstrual cramps. Gynaecologist Dr Anindita Dhar explains the connection between sex and menstrual cramps. Orgasm relieves menstrual cramps When you hit the climax your blood rushes to the uterus which relieves the cramps. At the same time your body releases chemicals that function as painkillers.