thread Nothing.
The problem lies in exposing yourself in a public place (and, while you're doing it, creeping everyone the fuck out).
permalink Which is why I am invoking the Trans argument
There is nothing wrong with dressing as the opposite sex, but it creeped everyone the fuck out, but the thing is that the onus is on them to stop getting creeped the fuck out.
permalink Bizarrely, I sort of agree with you.
I feel that society has a curiously low tolerance for nudity and public sexual behaviour.

However, the acceptability or otherwise of public masturbation must depend on context and consent - it's not cool for someone to be publicly objectifying anyone sexually in such a way (obviously masturbating in front of someone, clearly deriving pleasure from them without their consent).
However, it might be fine to discretely masturbate on one's own or with a friend in a public place without involving any non-consenting third parties.

The other aspect is politeness and manners - I can imagine that other bus passengers would not like to see me masturbate, so I consider it rude to do so. Same as nose picking, arse scratching, etc.
permalink That is pretty much how I see it.
If someone stood in front of me picking their nose at me, that would piss me off.

If I saw someone having a quiet wank in the corner of the park, I'd leave them alone.
permalink And vice versa.
But picking their nose AND masturbating?
That's over the line
permalink remember british society is world reknown
for it's backwardness when it comes to nudity sexuality and general intimacy
permalink Yep,
those frenchies are always spunking at bus stops.
permalink I feel like you already know
but to be clear, by 'creep the fuck out' I mean 'publicly objectifying anyone sexually' and 'clearly deriving pleasure from them without their consent'. I had a feel JoS would be along to say it better so I didn't bother to clarify.

I also notice in your response to him that you've completely skipped over his clear explanation of why it wasn't ok and why the guy ended up in court.
permalink He acknowledged I was right,
is how I read it.
permalink He did
whilst only actually acknowledging in words the bit that supported his earlier statements :)
permalink Well, I think that if a girl looks at my forearms and gets aroused, let her look.
If she wants to masturbate near me, that's fine too.

Mixing those - standing staring at my arms and masturbating - that's a no-no.

So I am obviously of the opinion this guy is a wrong 'un, but it seems an excessive penalty (to me).
permalink No one is going to wank at your arms, Manley.
No matter what you think they look like.