I have a few pairs of shorts like that where I can take it out with the same freedom (and no restrictions) I'd have without any pants on, fully bottomless, to jack off and cum, yet put back quickly if I had to. There was an old cloth chair in a motel lobby recently where I had shorts on without underwear and there was no one in charge there. Being very horny, I took my erection out of the side sitting there and went all the way with my right hand, shooting sperm onto the chair's left side, wiping my penis on it right after, then putting it back.