I had the radical prostatectomy 4 years ago.
Fortunately some nerve endings were saved.
The surgeon suggested masturbation to maintain some level of sexual normality.
With the use of sexual images on the web I managed to get a weak erection which was enough to reach orgasm.
What i noticed was that it was best when the bladder was not empty.
The orgasm contractions caused a strong ejaculation but with urine.
This was an improvement over ejaculation without urine.
For those who can still have relations with a partner a condom is recommended....