No Semen

This is a story (true) from me that had me scared because I quit ejaculating. I had a bout with kidney stones a year and half ago, and had to have minor techniques done. I didn't try masturbating for over a week, and when I did, I had the usual, if not better, climax than I had had for some time, but nothing came out. After a half dozen wankings, I thought it time I made a trip back to my urologist. He said that was O.K. unless I was trying to get someone impregnated. Not fully believing him, I made an appointment with my original Dr. and he told me the same thing. He said a lot of fellows would like that because there's no clean up. so today the only thing I do is have a small of pre cum, which I love to taste. Any one had this experience?