I'm curious why it bothers you so much. Is it insecurity on your part, jealousy or some other expectation? Since she's only been with one other man, it's not like she's done some things in the past that are very questionable.

I myself was a virgin when I met my wife, and she'd been sexually active prior to meeting me. In my case, I had trouble thinking I was going to be good enough for her in bed. But those were all unfounded insecurities.

I think the best advice I could give would be to not let the past intrude in your thoughts. Notice that they're there and address them. Tell yourself that it's just the past and has no bearing on today. Develop your relationship, work on it together and that past will be nothing but forgotten sheets of paper on the calendar.