Wow. Since this is completely anonymous, I'll be completely honest.
I've had sex with 7 girls. 5 of them were girlfriends
I've made-out-only with around 10. 4 of them more than once.
I've kissed-only with 3.
Now, please don't think I'm some whore. When you go to a college that is 70% women, and you are a pretty good-looking guy (that's what I've been told), things happen.
One thing I've learned: confidence is everything. Not arrogance, but confidence.