An active sex life isn't just good for your relationship, it's also great for your health. Dr. Berman says frequent sexual activity makes you look seven to 12 years younger, improves your immune system by 33 percent and decreases heart disease by 50 percent. It also decreases stress and insomnia and acts as a natural pain reliever, especially for menstrual cramps and headaches.
Dr. Berman says couples need to keep gender differences in mind when striving for a good sex life. Men take an average of five to 10 minutes to reach orgasm, while women need about 15 to 20 minutes. "If men are a microwave oven, women are a slow-burning stove," she says. "It's a big difference."