Some might say the human being lives and breathes for sex—that everything we do, is for sex. If we’re nice to someone it’s because somewhere, somehow, it’s going to get us sex. If we work hard at something—sex. I don’t know if I’d go so far as to say that, but I will say you’ll spend a lot of time, concern, energy and even money on sex in your lifetime. Here are some things I wish I’d known before having tons of sex that would have saved me all of the above.