Why do girls only seem to date scrawny guys?

I don't know why there are no 'big' guys in the media. but the comment about how only big girls date big guys isn't true. one of my ex's was a big guy, and the other was about 6"0, and weight in at about 200 pounds at least. and I'm not a big girl. I'm 5"1 and weigh 102 pounds. size didn't have anything to do with it.