Like you could blush any other way…
I’m going to try to offer up a possible answer. Just bear in mind that I have very little experience with virgins, seeing as the only time I was with one I was a virgin myself and really had no idea what I was doing.
I think virginity is prized because it is an ideal - a woman who has never known the touch of a man and is “unspoiled” and innocent. The opportuntiy to be the first to touch her inside, where she’s never been touched, is quite appealing to men. So yes, being “the first train in the tunnel” (I love that expression…) is preferred, just for the experience of being the first. The whole “boldly go” thing.
Also, I expect, there is a perception (right or wrong) that virgins are “tighter”, and therefore more pleasant-feeling. A man knows that she hasn’t been, er… stretched out by other men before him.