Who'd'a'thunk it: bumping uglies has a whole lotta health benefits. That is, so long as you're taking precautions to avoid the bad health effects of sex, which isn't to hard to do thanks to modern technology. I envision a positive feedback loop: healthier people have more sex, which makes them healthier, which lets them have more sex. You never hear of some muscular, attractive guy playing WoW in his mom's basement all alone, do you?