I haven't settled down, but I do feel like my oats are not being sufficiently sowed every once and again. I usually find myself in long-term relationships. No real explanation for that, it just is (how zen).
The best advice ever, is what I got from my father. He got himself caught in a hell of a marriage at age 23, and wasn't able to get out of it until 28 or so. He said "Son - I want you to have slept with more women than your current age before you get married".
Yeah - I've fallen a little behind