i could care less whether hilary duff is a virgin or not...but all this "why would a 25 y/0 stay with a her if he wasn't getting some" is bs. depending on your upbringing and standards, this really isn't that uncommon...age has nothing to do with it. if you really love someone and waiting is important to them, you wait. period. heck, it might even be important to him. in the article she even says he comes from a humble upbringing and has a really strong connection to God. they seem well matched maturity wise. who knows? there are more important things in a relationship than sex.
I admit I find it hard to believe, but who knows? I know a guy who is forty and still a virgin. He's a devout Christian, and he just hasn't met that special person yet.