Why do Priests become pedophiles so often?

I mean don't get me wrong i'm not saying all of them are or even a huge number, but it is in the news alot. What is the reasoning behind that? People tell me it's because they aren't allowed to get married to a woman, but that's a crock, if you are going to fall astray of your promise to god and all, why not do it with a woman...not a little kid...?