Gotta watch our terminology. For example, I had a vasectomy years ago. Had no noticeable effect on the amount of ejaculate (which comes from the prostate), but there aren't any sperm in it (they come from the testes). I received no reports of a taste change.
But stopping the ejaculation entirely is IMO both undesirable and a bit scary. When I was a kid, there were times when I got aroused in "inappropriate" times or places and tried to stop the ejaculation and it was damn near impossible. To do so chemically strikes me as Not A Good Idea somehow. It also sounds like it would take away a lot of the physical pleasure of the man's orgasm. So what's the point of the act, if you're not planning to procreate, and you're not going to enjoy it...??
Moreover, I'm not sure that women are going to like the idea of a "dry orgasm" in their man, except possibly those who are allergic to semen (there are some). Well, those who are wearing blue dresses from the Gap will be pleased to discover they don't have to take it to the cleaner, but it'll be harder to impeach their boyfriend.
All in all, not a great solution, IMO.
****
lol
"I received no reports of a taste change."
Dude.
Too. Much. Information.