Wow, sticking your head above the parapit on this question is difficult!
The fiction stories and some Guy's nicks/ids in the Chatroom suggest they are
young and very aroused etc by this subject. In my opinion there are probably young people born the wrong sex who are getting the right help from the right people whom they should be - but clearly young TS's have so many hurdles to cross and I salute their courage and hope they get full social and medical support, of course. I salute older people also adjusting their gender.
There is alot of fantasy stuff which often revolves around some ideal stud who is super hung and then chopped; such stories may make good 2 minute friction material for readers but men should walk into this fully aware of the life changing consequences. Sex was never my forte as a young man, but I enjoyed my daily orgasms and erections and young men should enjoy their libido but when other's are involved always practising safe sex, please!
For adult men, I think this is an issue that possibly relates to the menopause.
Do you agree that around 35+, certainly over 40, most of us become aware
that either we've become impotent or that possibly the thrill of waking erections etc has worn over thin? Starting off as a Chemical Eunuch, under the supervision of a Dr and with the appropriate blood etc tests, gives a man the opportunity to fully experience the totally new changes that they would face from surgical action, but choosing a chemical route enables you to decide not to proceed also. Men who start on the chemical route are far less prone to feelings of deep depression because nothing is immediately permanent. Indeed they may well feel "Eunuch Calm", whether or not this leads to surgery, who knows? If it does, the chances are that all feelings/thoughts/attitudes have been considered first.
Incidentally, one man's horror at "sprouting little embarrassing man-boobs" and "retracting penises", can be a source of contentment and comfort to the
person who has chosen and desires both
This is a very difficult question to address and there is no single answer.
First and foremost though throw out all thoughts of fantasy before consideration. Fantasy castration can be "enjoyed" by the virile man concentrating on it in as many orgasms as he wishes, over and over and over.
Don't rule out fantasy but never, ever mix it with reality!