Where is the line? Different parts of the body can be considered sexual and different lines have been drawn in the past. Should we cover all? Only below the belt? Only above the neck? Bottom is dirty, so that and maybe feet? Should only men cover their brest area, because it only has sexual funktion and no other function (feeding babies)? Fingers, the source of bacteria and who knows what, should we cover them?
If being naked in public was made legal, would everyone just walk and talk around naked? Would there be chaos? Would the benches be covered in poop and sweaty ass prints?
They're already covered in piss anyway, so how much worse could it really get?