Public Masturbation - Your thoughts

I often get horny when in all the wrong places, such as public transport, restaurants, bars, or outside. Now the 'issue' is I often need to masturbate and cum, there and then. Assuming no one sees or gets offended, is this OK? Please vote commenting your answer below. My future depends on it. lol

[1] Carry on as long as no one sees
[2] Carry on as long as I don't see it
[3] Stop it, it's very wrong
[4] I would love to watch you
[5] I would love to join you and masturbate together