Sex not only feels good. It can also be good for you. Here’s what a healthy sex life can do for you. 1. Helps Keep Your Immune System Humming“Sexually active people take fewer sick days,” says Yvonne K. Fulbright, PhD a sexual health expert. People who have sex have higher levels of what defends your body against germs, viruses, and other intruders. Researchers at Wilkes University in Pennsylvania