Why are you staring at women's asses, Eric? Are you a creeper? If you don't want to see someone's ass in a thong there is a VERY simple solution. Don't look.
Looking at your little Medium avatar picture, I'm guessing that if we met at the water park your flabby belly and moobs would be on display. Not exactly what I want to see, but again there is a simple solution for me. I just don't look. There will be a 10th of a second scan when we meet, then I'll tell myself: "Just don't look down, Jack." Problem solved!
Very few people look like underwear models. They can dress however the fuck they want, and as long as they are not physically molesting people - particularly children - then just mind your own damn business and stop being an asshole.