There was a very nasty and lengthy news report about that in Taiwan some years ago. All about how “t-backs” floss faecal matter into the vag. Still, I did manage to tune out to the white coated “expert” and maintain my focus on the gratuitous footage.
Not everyone confronted with butt cleavage wants to see it, unfortunately. I take a class where there are 6 young women sitting in front of me - 3 too fat to be showing their ass, 2 too skinny, and 1 just ugly. Nevertheless, they all wear low-slung jeans, pretty well every day. I’ve had enough.
Depends on whom you see wearing (or not wearing them). If you accidentally got a peek of something bad, you’d rather see the girdle. Otherwise you’d want to poke your eyes out to get the image out of your mind.
Can’t we all agree butt crack cleavage on fit, and attractive people (guys included) is a nice surprise? Of course, butt crack cleavage on fat, ugly people is not.