I am convinced there is some remaining instinct in the human male that encourages taking an outside wiz. Perhaps something about marking territory.
But there is a distinct difference in going #1 into an interior porcelain container vs the distinct pleasure of letting it fly in the great outdoors.
Ladies, you would not understand.
My very young (under 2) granddaughter caught me and my grandson doing it one day. The next day my wife caught her doing it, except she had pee running down her leg. ;-)
Oh yeah? One of my earliest memories is of the wonder of cr.ping in the snow. a steaming creation for a five year old.