What can I say? I love a guy whose brain is completely done developing and epiphyseal plates are just about entirely done fusing.
But seriously, he's actually a great guy-- pretty cute, really smart, really funny, and believe it or not, he can be really really sweet and thoughtful :) And it's nice to have a guy I can talk to about science and pokemon on an intelligent level, as well. We have a ton in common, from our interest in science to our political leanings to our lack of religious beliefs. There are more reasons I could give you, too, but I think you get the idea :)