The guy asking question is a pu$$y and he has an excuse cuz he's asking for a FRIEND....FULK you, i am pretty sure you're asking for yourself.

Here's my  understand:

You fell in love with a girl and she told you she had boyfriend in the past and you didn't ask her beyond that because you're scared. If she tells you Yeah she had sexual relationship, you'll get mad and you're FULKED UP, but if she says no she didn't have any sex, you'll feel happy. That's all you want to know.

You can pretty much feel it if you have sex with a girl, you can tell the difference most of the time. If it goes in/out smoothly then you can assume that she had past sex parterns !

If you accept her no matter what, then this question is stupid....If not move on find other girls, there are still many girls that are virgin.