I thought that I would log this as I could not see any history of this on this blog or indeed on the web.
Perhaps this is coincidental (which would surprise me) but initially after my biopsy I had a couple of "normal" (if very bloody) ejaculations. After a few weeks of inactivity I then started having dry orgasms. I spoke to a urology nurse who said that this was due to retrograde ejaculation whereby the semen actually enters the bladder. Apparently this is because the bladder neck muscle fails to tighten sufficiently to prevent this and to direct the semen down the urethra.
A cruel trick to play on me just when I would have liked to have had a final "flourish" before my Covid-delayed op (tomorrow as it happens)!