The rule is there is no rule, I had one gf that I thought was THE ONE (silly high school days) and we dated for at least 9 months before did anything more than kiss. I mean, we completely kept our hands off each other, there wasn't even any groping going on. It was probably another year after that before we actually had intercourse, though we slowly led up to it by doing everything else. My wife though, jumped me on our 3rd date, told me I had way too many clothes on and that she was going to rape me unless I kicked her out of my apartment (I didn't, no brainer there
). We had known each other for not even a week. That was 5 years and one kid ago.