I know what I want out of life. I want to tell stories, I want people to read them, I want to get paid for it, and I want to love a woman. There are many other, secondary goals, which I'm working towards at my own pace. And of course there are pointless side trips, like gaming and doodling, because everything can't be important.
I don't smoke, drink, or do drugs, because I'm afraid those things could get in the way of my goals. I don't want drugs or alcohol to control my life--and before you say, "It doesn't control mine," or, "I know plenty of people who can do that stuff in moderation," for every person who can control their drug intakes and keep an even keel there's somebody else who gets consumed entirely. It ain't worth the risk, especially since I'm not convinced those things can give me anything I can't get somewhere else.
I do cut loose. I get out on dance floors, and binge on jellybeans, and randomly throw out my most closely guarded secrets. I don't need drugs or alcohol for that.
As far as sex goes, I am legitimately not interested in casual sex. I'm not saying that as some kind of high-minded evolved superbeing guru type--I'm still sexual, and manage those urges in the traditional method, but the thought of having sex with a woman just because I find her attractive is unappealing to me. Not repulsive, just...unappealing. The thought of having sex with a woman I love is somewhat more inspiring, but I haven't met the right woman yet. I'm not abstaining because I'm scared of sex, or because I think it's the right thing to do, or because I think it will keep me morally pure--and I'm not doing it because I don't think I could get a girl, although I've honestly never met anyone who'd motivate me to try. I just don't particularly want to, just like I don't particularly want to take a sewing class or learn Portuguese or watch an Italian soap opera. Not wanting to do those things doesn't make me feel superior, and I've got nothing against anyone who indulges in them, but there's nothing that'd motivate me to try them either.