Does finasteride affects prostate sensation?

As a man, I don’t know what you are talking about. I have never felt my prostate in any manner. If you are talking about orgasm, then yes, I have heard that finasteride, in some men, will reduce the volume and consistency of the ejaculate, and that may decrease the pleasure of orgasm for some men. I had taken finasteride for many years and never felt that my orgasms were any different than when I was not on finasteride.