Would depend on the person and why they are a virgin, they could be religious, asexual or just plain unlucky and are waiting for something good. Doesn't mean they're creeps/undesirable/ugly/not confident etc.
Means fack all to me mate! They are human the same way you and I are human. Am 23 and counting, and I have never had a relationship and a virgin. Sometimes it can be a good thing but I know what I want in my life at least now. An interesting job and a better perspective of the world is what I want now
So what about people like me who are confident and willing to speak to guys and especially girls? There are a few cute girls at my workplace and I speak to them and I never had any relationship and am virgin. I think people may be in a position like this for all sorts of reasons INCLUDING being quiet and shy. I never made a real effort when I was younger and just wanted a good degree and job - that was my goal anyways