I'd always been good friends with the guys I dated before we started dating, so we already had that emotional connection I need for sex. It still took a month or two of dating with each guy tho before we had sex.
It depended on the person. Some I could tell we would have to wait, others we jumped in the sack the first date. My wife and I had sex on our second date, the only reason we didnt on the first was because we where not in a place we could.