>>381583645
Because even discounting anything sexual, most people consider girls prettier than men. Girls are always evaluating each other on their appearance and if you ask them, can tell you with just a glance how pretty another girl is. If you put a picture of a random guy in front of a man, by contrast, they'll often have no fucking idea how to rate them unless they're obvious 10s or sub-2s. And when they do rate then, if you break it down you'll find they're using completely different criteria from what women would use to rate the same individual. 

The point is that female bodies just have more universal appeal.