I wouldn't want to marry a virgin. I would want to give the marriage every chance to work and to last a lifetime. Sex is far too important in a marriage to leave it to chance. It involves not only a physical act, but emotional communication on the deepest level possible.
Finding out on the wedding night that my brand new wife can't or won't communicate with me on this level would be devastating to me and to the marriage. I would feel betrayed and resent it very deeply. Not the way you want to start a lifetime commitment. It's a very dangerous chance to take.
Would you wait until after you married someone to find out whether he/she wanted children? Whether they had any serious personal issues? Or anything else that you might consider very important to know before you tie that knot? Sex fits in that category.
Before I get off the soapbox, I have also known girls who were virgins, and then decided they did not want to wait after all. What they did after that was scary... they decided they wanted to make up for lost time, and do it all at once. And I don't need my new wife thinking that she needs to find out what she had been missing all those years, either.