Well, firstly, not all the guys are looking for big boobs and ass. I know a lot of guys who are actually turned on by skinny ones. Especially gym-fans, most of the bodybuilders I've met like super tiny little girls. Secondly, there are certain reasons to treat girls in this way, the main of them is that there are plenty of girls who are looking for one night stand, so this kind of people usually find each other. In the end, Tinder, badoo, work the same way - you will not get likes from the girls just for nice description of yourself. People are selective, because they know they can get both sexy woman and nice personality if they try really hard, or at least they want to believe so.