The exact same thing happens/happened to me when I first started going out with my girlfriend and still even today, she just looks way too good for it not to turn me on!
I'm with the others that said it's nothing to be ashamed of... I guess if your friends saw it, it would be embarassing. But infront of your girl is nothing to worry about it. I bet she takes it as a compliment - and if she doesn't see it that way, she should
