You might want to read this great Prostate Massage Guide, including a video, found here https://www.verywellhealth.com/things-to-know-about-prostate-health-4066015

shared by two alternative medical doctors discussing possible benefits such as for enlarged prostate, chronic prostatitis, ED as well as the potential pleasure that can be achieved from the prostate.

Source:

A Guide to Prostate Massage by Emily Morse, PhD. June 13, 2021. Very Well Health

https://www.verywellhealth.com/things-to-know-about-prostate-health-4066015