Original Poster again. So another thought. After radical prostatectomy 12 years ago plus recent salvage radiation still have a PSA due to metastasized cancer cells which they can't locate, but they are there somewhere. If you still have testicles, and not on Androgen Deprivation Therapy, then my thought is masturbation or any sexual activity does release testosterone which "feeds" the hidden cancer cells, which might enhance prostate specific antigen as the cancer cells proliferate. The metastatic cancer cells are somewhere in your body, whether or not you have a prostate gland and as they proliferate or spread your PSA will rise. SO my guess is that because testosterone release with sexual activity "feeds" those cancer your cells that have metastasized your PSA will rise, and probably sexual activity should be stopped or minimized.