That’s because your question was ambiguous.
If you mean a moral obligation, it’s difficult to think of many situations where there is an absolute moral obligation to reveal details of one’s past. There are so many differing factors to consider.
Having a contagious disease would be one, but that’s a present issue. Having children, you would think, but even then there could be extenuating circumstances.
I’m not sure what prompted this, but even among the trans community you’ll get a pretty overwhelming agreement that the answer is yes. Partly it’s an ethical thing, but it’s also largely an issue of personal safety and practicalities.
I always disclose that a small number of people in this world are not comfortable with my forward looking modernistic art.
It came from the (since removed) borderline joke in the borderline jokes thread, about a guy finding out the person he’d slept with used to be a man.
Got you. It’s definitely something that lives in the brains of cis straight men far more than it exists in reality. Even the go to example of the Crying Game is not really an example of this given where he picked her up. It was more of a case of him being unwilling to see what was in front of his face.
So did those of you who have seen the film anticipate the reveal? I was definitely unsuspecting!
Nope, didn’t see it coming
We were seeing through the unwilling eyes of the IRA guy so no one watching would have had any idea.
I’m struggling to recall. Was the lover transvestite or pre-op transgender?
Graham Linehan is a horrible bigot.
But back to my initial question.
If transgender people feel under an obligation to disclose their original gender, does that suggest society still has some way to go or will that always remain a moral/ethical (whatever) obligation/expectation - and if so, when would that kick in?
I would completely flip the framing. Disclosure and openness about expectations and limits are the norm in non-cis, non-straight sexual encounters.
So many of the problems in cis-straight sex is because this sort of openness is not commonly done and considered awkward. So, I think rather than thinking about society moving to a point where this sort of information needn’t have to be disclosed to a potential cis-straight sexual partner, we should think about how we have better more satisfying cis straight sex by embracing the same openness that is the norm in every other community.
That’s a good point.
Kind of reminds me of that Friends episode where Monica “cures” Paul (?) of his impotence 
I have to say that I went to see a film about the Troubles that Jonathan Ross described as having an unexpected twist in. I was half expecting the IRA guy to turn out to be a protestant or something so the eventual reveal was completely left-field. I was actually impressed at how they kept that secret. Actually, I was impressed overall, it’s a very good film. I’ll have to watch it again sometime.
This remind me of an heated argument in my local O’Caseys here in The Hague. An English man started to talk about the IRA and used the term the troubles. Out of the blue an Irishman responded, “the troubles”, it was a fu** war you idiot, only a fu** Englishman would call a war “the troubles”.
Staff had to step in to separate the two … 
My mother’s family were from an Ulster Protestant background and my father’s Scots’ Catholic. Family get-togethers in the 1970s were full of euphemisms!
Years ago there was a play performed in the West End called something like “Romans in Britain”. Mary Whitehouse the right-wing moralist objected to the play as it contained nudity and simulated sex acts. The press got behind her, decrying the decay of the moral fabric of the UK. The play was canceled due to the front page outrage and replaced by an Agatha Christie play. There were from memory, 3 murders in the Agatha Christie play.
A joke on this site about a transexual was removed as it was deemed offensive. Today there is a joke posted about suicide and murder that has received many “likes.” and there is not a mention of offense. It is a pretty good joke and I found neither joke offensive.
Why then is it ok to comedically depict murder and suicide yet not ok to depict a “twist” in a sexual encounter or to depict for instance on the West End, sexual attitudes and acts from over a thousand years ago?" No judgment here on anyone - I am more interested in the mental and moral gymnastics that get us to this point in society.
This might help shed some light. Or it won’t. In any case, it’s only a start in untangling the long history of the relationship between humanity and sex.
Think this sort of thing happens far too much and I find myself asking why - just, why?