Ds1 is 4 and always sits. We started out that way because he often decided he needed to poop too while standing to pee so it was just easier to sit in the first place. He still prefers to take off his pants entirely and that part is a PITA in public restrooms. He's starting to lock the stall door while I stand directly outside so its totally up to him to put his clothes back on if he takes them off in the stall. Its definitely easier in the summer with shorts because they aren't as restrictive.