F8 said...
i had very small amounts of fresh blood in semen periodically when i was younger from rupturing vessels while lifting weights
Same experience, not from weight lifting but from God knows what. Only happened one time, i was in my late 40's. Ran to urologist who told me it happens all the time, a blood vessel ruptures. Never happened again.
Of course, after PCa treatment, maybe its different issue. Maybe not though. Sorry i cant be more helpful, other than to say it MIGHT be no big deal