I feel the same way about guys. I guess i'm conventionally attractive and I've dated some real uggos and I would get a lot of shit for "why are YOU dating HIM?" a lot of it was pretty insulting "does he have a trust fund I don't know about? or just a really big dick?"  For the most part, if you take care of your body and have a decent personality, a large nose or bushy eye brows, or narrow jawline is not going to make a huge difference to most girls (seriously! girls are more forgiving on looks than guys are).  But a fat guy? The idea of even going on a date and sitting at the same table and having to make conversation with a grotesque dat dude makes my vag so dry I think it might fuse together.