My ex and I waited just over a year before we first had sex. In her mind, that was too fast. But then again, she hadn't even explored her own sexuality much by that time. She was pretty sheltered for most of her life before she happened upon me.
I'd say it depends on who you're dating. Personally, I'd go right for it if the opportunity arose. Then I'd chastise myself for moving too fast it might have jeopardized my chances at a long-term relationship. If I wait, I literally go insane wanting it. Not that the constant teasing doesn't excite me to to end.
