For most, if not all POIS sufferers, "damages" are cumulative... each additional ejaculation will make the symptoms more severe and will cause the POIS attack to last longer.
I agree, especially with symptoms being more severe but don't you think that after the recovery period one can feel better off afterwards for a longer period before relapsing if you have multiple ejaculation. I don't like to have multiple ejaculation though because of the more intense suffering but it seems that I feel more refreshed after the 7 day recovery or just feeling "cleaner" for more days than normal afterwards. Basically I tend to last longer before possibly relapsing again if had multiple ejaculation!
I tend to stop at two ejaculations though cause otherwise the agony while healing tends to be worse, and the suffering usually does not seem worth it!
I sometimes wish it was at least possible to empty all our semen without having sex or masturbation; like with a pump mechanism or something!
Multiple ejaculations were out of the question for me, because of work and kids to attend to - these cannot be postponed.
Being 59, I have no longer the problem of accumulating too much fluid in the prostate so that it has to be emptied through sexual activity or a nocturnal emission will happen ( NE). A sure sign that my prostate was full was that passing a large stool would cause some prostatic liquid to be expelled and appear at the urethra opening. This is not happening anymore, one of the advantages of getting old with POIS is that the prostate is far less productive, so no more NE !
Back a decade or 2 ago, I sometimes tried to avoid NEs by doing "prostate emptying", but with no sexual activity. I figured out that if the mechanical pressure of a passing stool could help empty the prostate, I could do something similar ( I will leave that to you to evaluate and find a way to do that - ask privately a physician or urologist you trust) This would cause me a very mild form of POIS, but that was better than having a NE at a very inappropriate time ( I suppose other could have full POIS with this, I cannot know ) I also timed my sexual activity on weekends to have a release, using my pre-pack to minimize the symptoms, so that I wouldn't have a NE. At around 45 to 55, one release every 2 to 4 weeks was enough to avoid NEs.