I had been through both MBA & SBA myself and friends around me are doing the same thing.
I think is best to take it as common incase 1 day my wife do the same thing to me

common or not I think first ask yourself can you accept a girl which is not a virgin. If you can then don't ever make yourself worry to find out did she or him do such things.
For me I had found the one I love and I knew I love for and respect her so I won't do that anymore, just try my very best to love her. If she still do it, well at least I tried my best.
Are you worry that you will find a girlfriend or wife that is like that?
If you are worry you will never find one perfect girls friend.
Love is gamble learn to trust, forgive and forget.
No risk no gain and no pain no gain too.
1) Am I out of topic? sorry if I am.
2) sorry my english no good.