I don't think the other thread was different at all, it got into this discussion if you read all the way through. Sure originally it was about methods of hair removal but then people were discussing whether it was sanitary etc etc etc.
I really think it looks pre pubescent to have it all shaved off. Its just nice to keep it shorter so you haven't got a wise man's beard or anything (ha ha ha). This for me isn't really a sexual reason, I actually found it quite uncomfortable, especially in summer time. I think people do feel cleaner for totally waxing....
Anyway, you're only 17. I just say, trim, take showers, don't get rid of all of it! Otherwise you'll feel 50 times younger than you are and that is ick believe me...
And if you're worried about sexual stuff then just do it in the dark >_> Guys don't notice anything I swear haha