[NSFW] TGIF Question -- Why pay a doctor for a prostate massage?

I’m no doctor, but I don’t play one on television. It just seems like to me that if seminal fluid is backing up in the prostate, whacking it till you can’t produce any more would fix the problem at substantially lower cost than seeing the urologist. Not just that, unless you’re gay or have a pretty female doctor and are into ass play, it seems like it would save a ton of embarrasssment. Ladies, don’t feel excluded because this quetion deals with male anatomy. If you know how the plumbing works, and know I’m missing something in my lame-brained analysis, feel free to point out that I’m thinking with my little head. This is an equal opportunity asker.