Wow, for once I agree with Fas on something he said regarding sex and women.
Good points. Frankly, my first girlfriend was a money grubbing <expletive deleted>, and I was warned by my mother, father, step-father, and friends. She was cute though, and I thought I was in love, and I ignored them all until I realized it myself. Chances are if your son does find a girl that isn't good for him, and you tell him she isn't, he won't care what you say. However, I'd still find a way to point it out without seeming like a know-it-all, controlling parental unit. (Which, is terribly hard to do being a parent saying something that your child doesn't wish to hear.
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@ Chus, I thought you were older. So many things make so much more sense now!
As far as wishing someone would inform you what is and is not ok, why not ask? I wouldn't be crude about it, that'll get you nowhere with most people, parents especially. However, being honest, and not giggling or smirking may get you a response that is mature and honest as well. It really is hard to get a straight out, honest, and respectful answer about a lot of topics from most adults when you are young however.
Young doesn't mean stupid, it means inexperienced and learning.