I saw a butt crack recently

I was in a mall and a young man in front of me bent over to look at something in a display. And I was treated to the sight of most of his naked ass. Not only did I not need to have that image forever burned into my brain, but I must once again ask… how the hell do they keep those pants on? Do they have a constant erection and their penis acts as a hook holding the pants up? And my parents thought I dressed weirdly in the sixties. They had no idea what was to come.