If you feel like faking a headache when your partner wants sex, think again! Making love actually has many hidden health benefits -- migraine relief included!

Sex eases migraines

Almost 50 percent of women report post-nooky migraine relief, according to Randolph W. Evans, M.D., clinical professor of neurology at the Baylor College of Medicine in Houston. Evans believes that the release of morphine-like pain relief endorphins after sex aids to relieve or reduce migraine headaches.

Sex improves your immune system

According to a study by Wilkes University in Pennsylvania, people who have intercourse at least once a week show a 30 percent increase of the antibody immunoglobulin A, IgA, your body's first line of defense against colds and flus.

Sex reduces stress

A study by Biological Psychology found that people who have sex have lower blood pressure than those who abstain. It is believed that sexual activity creates a calming effect that lasts at least a week.

Sex cuts your endometriosis risk

Women who orgasm frequently are less likely to develop endometriosis, says Harvey Kliman, M.D., a researcher at the Yale University School of Medicine, who conducted the study to explore the effects of orgasm on endometriosis. Kliman believes this is due to uterine contractions which push out debris that might otherwise go back into the fallopian tubes.

Sex boosts your bladder control

Squeezing your pubococcygeus muscles -- the ones you use to stop the flow of urine -- during sex not only helps you achieve the big O, it also strengthens your bladder control.