Several others have made similar comments, so I just wanted to insert my two cents... if you believe in a perfect, unchanging God who created the universe and laid down these moral standards, then of course there is an absolute, universal morality. But if you don't believe in such a God then it would be hard to justify absolute morals...The one major problem I have with most religions, and most religious people for that matter, is this belief that there is some sort of universal morailty, there isn't.
And to answer the original question of the thread... I personally want to remain a virgin until marriage, and would of course want my spouse to share my beliefs and also be a virgin. (And besides my religious beliefs, I think it would be wonderful to tell my husband on our wedding night that I waited my entire life and saved myself for him!) But of course we all make mistakes and do things we regret later... Anyway, elchulo, there's nothing wrong with you being concerned that your girlfriend is not a virgin. I would encourage you to get to know her a little better and find out why she slept with those guys, whether she regrets it, etc... if you both have similar opinions about sex, then that's a good sign that you will be able to work this out.