I have to agree with
JoeTheMC84 on this one. If you decide a girl isn't a virgin, best to just not mention virginity, experience, or former/current lovers. One of the biggest turnoffs for most people is hearing about an LI's previous experience. Your best bet, in my opinion, is to make any girl a virgin that could possibly be a one.
There's actually a VN where one of the LIs is a mother, who actually gave birth to a daughter(who is also an LI), but was still a virgin before sleeping with the MC, and that VN is immensely popular.