"Would you ever consider a transman a man?"
I find this a really difficult question to answer because until relatively recently I had no idea that transmen existed.
Before I knew that they existed I met a couple socially with their children and I assumed that the husband and father was a man. A couple of years later I had some dealings with the husband as part of an event I was organising. It was a few years later after that when a mutual friend told me that the husband was a transman. If I had not been told then I would still be completely in the dark.
Had I met that person when I was younger I would definitely have found them attractive enough to have fancied them, ie. with me thinking that they were a man.
This is all hypothetical about how "younger me" would have reacted if I had got into a romantic relationship with that particular person and then discovered that they were a transman. However, I suspect that the mere fact would not have bothered me back then.
When I was told that the husband was a transman, it made a few things slot into place and perhaps explained some things that I thought were a bit unusual about their behaviour, both on first meeting and then later in dealings about the event I was organising. Definitely not that this person "behaved like a woman" but rather that they were very emotional and seemed to have quite a high level of anxiety.
Again before I knew that transmen existed, I knew another couple quite well and I now suspect that the husband was a transman. I didn't question anything about appearance or voice ("camp gay male" is the closest description) or behaviour at the time.
Something that did deeply confuse me was the first time that I encountered the couple outdoors. I was expecting to meet them and a couple approached from the distance, who I took to be two women. As they got closer I recognised the wife but the husband, who I knew much better, wouldn't "come into focus" is the best way I can describe it. It was only when they were almost within arms reach that I saw who it was. At the time, I put it down the way that he walked, without knowing that gait is a distinguishing feature between men and women.
Another "clue" that I think I have to the fact that the husband was a transman is a shocking warning that I was given by a friend. He said that if my then husband and I were invited to stay then this couple, who seemed very straight-laced, might well invite us to sleep with them and that the husband would invite my husband to have sex with his wife.
I did know that the couple were open about having difficulty conceiving and they did go on to have a baby using IVF. I might be putting 2+2 together and making 5 but my feeling now is that the husband was a transman and that the couple were trying to trick male friends into impregnating the wife.
Now I know that transmen exist, I have my suspicions about a healthcare worker who I have encountered a few times as a patient. Short, very slightly built, deep voice, bearded - with the tiniest hands I have ever seen, very small hands even for a woman. I have always found this person really nice and friendly and easy to get on with, something about their manner being very reassuring and totally unthreatening. I guess I will never know but I have my suspicions.
If we are talking about considering a transman as a man socially, I would prefer they were open and honest. If I knew their status then I would not consider them to be a man but I think I would have a hard job considering them to be a woman. A female, yes, but a "different sort of female" to a woman. I am talking about someone who I would assume to be a man unless I had been told different. A woman who has just had a hair cut and declared that she is a transman is different. I could never consider such a person as anything other than a woman.
As far as "romance and sex" are concerned, now that I do know that transmen exist AND I know about the medical and psychological aspects, even if just testosterone, I would definitely not consider an "out" transman attractive. I would be much less forgiving than I suspect my younger self would have been if I now became attracted to a "stealth" transman who then explained, or revealed, themselves to me. I would feel that they had acted manipulatively and had not treated me with respect, just as with any other major deception.
My younger self would have been, "Don't knock it until you've tried it and what have you got to lose?". I have tried quite enough new things over my lifetime to last me til I pop my clogs and what I do know from experience is that neither a micropenis nor a velvet cup and boobs do it for me. Middle class leftie men are also the worst in bed and worst at relationships IMHO so they can fuck right off too.