Here are few reasons why men love to end-up with a virgin girlfriend or wife (quoted from: http://www.whatdomenreallythink.com/howto/what-men-think-of-virgins.php)

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Trusting becomes quite easy – When a man knows that his girl is a virgin, he deducts that she has not had a serious relationship with another man before. So there is no "ex-boyfriend" issues to deal with. Moreover virginity also implies that she is a lot more restrained in the pursuit of sex. A man would find that comforting because he would believe that she will not go astray in the relationship and she would stay loyal.

There is a sense of responsibility – When a man knows that the girl he is with is a virgin (or was virgin before their relationship) he automatically develops an attitude of loyalty. Since he is the first man in her life it brings about a sense of responsibility, almost a need to ensure he does not cheat on her. This is not true for all men though.

Men feel secure with virgins – It’s true that most men feel strained about their sexual performance. For a man it’s quite an insult to come across as a sloppy lover. While having sex with an experienced girl a man is not quite sure of what she is thinking, she might be comparing him with some of her ex-lovers. With a virgin he doesn’t have to harbor such fears. A man would feel comforted knowing that she will not be comparing him with other men while having sex with him.

It’s a special pride to "deflower" a virgin – All men dream of deflowering a virgin and be the first one to give her a sexual experience. Virginity is still quite a sacred thing in a man’s dictionary and he does value it. It definitely eggs his ego to sleep with a girl who is a virgin because in his own mind it’s an achievement that a girl is willing to give up her virginity to him. It’s definitely something he airs his vanity with a surge of pride.

"Virginity" implies serious relationship – When a man discovers that his girlfriend is a virgin, he immediately gets serious about the relationship. If she is a virgin it would imply that her first relationship would be a serious affair for her and so a man automatically starts taking her more seriously. Men think virgins are definite “marriage” material. With a girl who is not a virgin there is initially the tendency to be casual about the relationship until there is a deeper bonding.

If a girl is willing to wait for the "right" guy to come along before she loses her virginity, there is a good possibility that her first relationship might well end up in a stable marriage. In India men still prefer, or rather demand, that their wife be a virgin and most Indian marriages last for a lifetime. In Eastern countries men really think highly of virgins and esteem her to be traditional.

As far as marriage is concerned virginity is still important to men around the world, it’s just that they have stopped setting their expectations too high.