I have always been wondering this question. I've been asking all of my friends about it, but I'm unsure of their answers. So I want a professional answer. So my question is: when wearing a condom, do you HAVE to pull out before or when you "erupt", or can you just keep going?

I'm 16 and I've been thinking about having sex with my girlfriend for awhile now: she is ready, I'm still deciding but I think I will with her eventually when I'm ready. When we do there is no doubt in my mind that I will use a condom and I already have one but I really dont know much about them because everything I hear from programs at school or whatever is dont have sex, sex is bad, your not ready, etc. I never hear anything about having sex but with a condom really I know there is a chance of the condom breaking but exactly how big of a chance are we talking about here because a 10% chance and a 90% chance are two totally differnt things also is there a way for her to get pregnant if the condom doesnt break? I don't know how that would be posible but thats why I'm asking because I don't know, also can stds be transmited while using a condom even if it doesnt break?

How's sex done?