I was always under the impression that when in doubt, it's legal to whip it out, but only if you got you a rock 'n roll band.
The Paul Reubens case makes me question the legality of these.
Other options to consider:
1) Gym shower with a few friends?
2) Broom closet with closed door with just you and a friend.
3) Vacant alley behind the porn theater while in the back seat.
4) YMCA parking lots when "No one is looking"
Sorry man, I had to do it.
The Paul Reubens case makes me question the legality of these.