Many men seek purity in women. Some men view them as of higher value; as something beautiful. The idea of purity is very important, especially when a man is looking for a long term relationship.
Now, personally I do not care for purity – in fact, purity for me is unattractive in the sense that it is incongruent with sexual liberalism. I enjoy female sexuality; I find it hot, sexy, and mysterious. It gives me so many kicks, you have no idea.