Did you look at them?
If you were a girl, did you look at your nails like this?
And if you're a guy, did you look at your nails like this?
(I know, I know--this is a girl's hand. I couldn't find any pictures of guys looking at their fingernails. I had to search for the letter "e" in sign language to find this picture.)
This is basically a universal truth. Girls look at their nails one way and guys look at it another way. I'm not exactly sure why this is, but I think it may have to do with nail polish.