It begins to slow down when you turn 20. It isn't like when your 16 and pretty much jerking off to the same mental image of some chick with hard nipples busting through her thin shirt you saw earlier that day, or the chick you just split. I can't specifically say at this point what my tendencies are since I've never really taken notice.
Though, its kinda creepy that I'm posting this in a thread started by a...16 year old? right?
*bails out*