You'll Be Healthier Sex is good for your immune system. According to Mintz, in one study, women who had genital contact or stimulation from their partner once or twice a week had higher amounts of immunoglobulin A (an antibody that is the body's first line of defence in fighting off disease and infections) than those who had sex less than once a week or not at all. Image Source: Unsplash.com/Sharon McCutcheon