At least you can tell from the profile pictures! Although I have become good at seeing the "tells" in a profile picture, and don't even bother checking the other photos they have if there's a single sign of being a fatty in the profile pic (eg MySpace angle, no collarbones, tight face crop, car selfie, group shot etc). Attractive women just make a full (or at least waist up) body shot their main profile photo I find, and I can just swipe away the rest. It actually surprises me how many non-fats there are on okcupid and tinder for the reasons you give. Source: previous and current shitlady GFs found on each, respectively. You just have to be good at wading through, detecting and filtering the hams though and be patient. I suppose as others have pointed out that they are sick of being hit on by hams themselves in public spaces and at work etc. I can't imagine the messages they must get on these sites, and the foul beasts that send them, though. It's going to be a shame when all the obeast "nice guys" finally drive attractive women away from dating sites with their disgusting behaviors.