sometimes i do sometimes i don't,
i piss a strong stream so i haven't ever had the aiming problems some guys here talk about, it goes right out through my skin, and if i pull it back it's still a straight stream. but i did know an uc dude that when he pulled his skin back he got a split stream and one half would angle up and the other half would angle down. so he actually needed his skin to guide it into str8 ahead.
i dont' dribble alot after i piss etiher it's a pretty much either on or off, so even if my skin isn't pulled back there's not alot left to leak out.