I propose the theory that fat chicks are desperate, and therefore will even go so far as to accept rape to a degree.
Now before I go on, this has been compiled from lots of drunken walks through Towns and Cities at night, whereby said fat chick would make remarks like "oh I hope I don't get raped!". Weird, eh?
It is because who would fuck a fat chick? I mean, you may if you were desperate, but the real land whales have pretty low self confidence and will never get laid, so this is where my theory comes from. If anything they are easier to attack (slower), more likely to resist (low self confidence) and might even have some weird rape complex whereby they are grateful.
I'm not condoning rape in any way. In fact this is all from, like I said, listening to girls talking over the years - and it culminated in a 6:45am hungover rant.