After a prostatectomy, you will no longer produce semen, as the prostate, vas deferens and seminal vesicles have been removed. You will still feel the rhythmic muscular spasms and pleasure that accompany an orgasm, but you will no longer ejaculate. This is called a dry orgasm.
Some men notice a reduction in the sensation of the orgasm. You may worry that a dry orgasm will be less pleasurable for your partner. However, most partners say this is not the case, especially as many do not feel the release of semen during intercourse. Semen production is also affected (reduced) following radiotherapy.