I have the same problem. My very experienced Urologist told me that it must be retrograde ejaculation. And there does not appear to be any alternatives. The body continues to produce the stuff and it has to go somewhere. I was told that the condition is irreversable.
It is shocking to me that there appears to be a complete lack of interest in retrograde ejaculation. The Urologist didn't know what causes it and my general MD never heard of it. I have exhausted all the leads I could find on the Net.
Simply due to the lack of research on this problem, it appears to me that the current thinking is that if a man can maintain an erection and come to a "climax" there's nothing left to talk about. I'm told that the "orgasm" is in the head not the genitals. A whole bunch of people in the general area of your expertise need an education about the male end of the sexual experience.
When a man ejaculates the first time in intercourse it is not the last. Without any further stimulation the ejaculatory muscles continue to involuntarily contract every few seconds until all the accumulated ejaculate is ejected. How many varies with the individual. And each one of those subsequent contractions is extatically orgasmic decreasing in intensity with each subsequent one. In other words, there is an initial peak orgasmic experience followed by subsequent ones decreasing in intensity until there is nothing left to eject. And the great feeling may last even longer if insertion is maintained as long as the penis remains erect.
The problem (at least with me) is not just the lack of visible ejaculate. It is that there is perhaps just one weak ejaculatory muscle contraction along with a quick "climax" followed by the evaporation of libido. That's it. No subsequent orgasmic contractions. And there is nothing wrong with my ejaculatory muscles. I can do a Kagel exercise and hold it for at least ten seconds.
Stop calling the condition retrograde "ejaculation". Threre is no ejaculation either forward or backward. Call it a "retrograde emission" because that's all it is. It's not a normal male sexual experience.