How much "history" is too much for your S/O to have?

Obviously we all have baggage and “history” coming into a relationship (unless you’re like high schoolers or something). I know full well my current g/f has had sex with at least one other guy, and probably as far as 3rd base with even more than that. I’ve known past g/f’s to have had multiple partners prior to me. I even had one g/f who had been pregnant prior to me. By in large it doesn’t bother me, so long as I’m the only one after they’re with me… and for the most part as long as I don’t have to hear about that “history.”

But what things about a SO’s history would be deal breakers for you? I’ve had one g/f who took great issue with my “number” (in fairness though she was a virgin at the time). Is there a certain number of sex partners that would be a limit for you? What about oral sex partners, is that number higher? What about just people they’ve kissed even?

What about other details too. I try not to hold someones past against them, but I don’t think I could bring myself to even date someone who had been (or for that matter was at the time) a stripper, prostitute, or porn star.

One aside… What if that SO has a history with a close friend or relative of yours? Some friends and I have had at least flings with the same girl. It bothers me to think of my X’s with a friend of mine, and I could never picture myself seriously dating or even hooking up with someone who was a major SO of a friend/family member.

And as a much lesser aside, does it bother you to know that your past SO’s may be adding to their numbers? I’ve been with two virgins in my long history, and it bothers me to think that I’m not longer their only guy. One of them is fairly recent so it makes sense, but the other was over four years ago and I have zero emotional attachment to her at this point.