Why should you enjoy more sex? (Apart from fun, I mean.) Because, according to several recent studies helpfully reviewed in this Forbes article, more sex may help you: run a lower risk of heart attacks and strokes, develop stronger bones and muscles, suffer less depression, and fight off colds and flues more effectively. Sex-rich men seem to get prostrate cancer less frequently; their female counterparts have an easier time with PMS.
Can you get too much of this good thing? Here's the self-same article's surprising take: "If you're female, probably not. If you're male? You betcha." I'm no economist, but I sense a supply/demand mismatch.
I hasten to add that these benefits speak only to the physiological effects of increased sex—not the emotional, philosophical, or financial ones. Also, these results assume away the problems of STDs. Still, though, I think it a community service of sorts to spread the good word about sex. Some of you single fellows might want to tuck a copy of the article into your wallets, next to your condoms, keeping the former ready at-hand should you find the latter sadly underused. Of course, if you really want to enjoy more sex, you ought to get married.