Yes but it might not be the SSRI itself or on its own (as you will know with your education) there could be a number of factors that interact with the drug itself, could be a particular genotype or phenotype that is susceptible.

Microbiome is also an important factor these days (would come into phenotype).

I'm also aware that there have been bad batches of pharmaceutical drugs - not just tampering but contamination is a potential issue whilst rare it does happen. There were cases of eosinophilia myalgia syndrome from tainted pharmacy batches of L-tryptophan in the 80s which were traced to a Japanese lab.

I'm curious you mentioned you have your own theory - would be interested to know what you think given your clinical knowledge and your discussion with others who have experienced it as well as yourself.

Do you have a good psychiatrist or other physician (e.g. urologist) who you are seeing about his and could do some digging on your behalf - maybe even do a paper on your case? The important thing with these rare reactions is that they have to reach the awareness of the medical community before anything will be done.

It was similar with the association between SSRIs and suicide.

At first people thought it was just the normal improvement in mood that was causing it - it was only after very carefully looking at the evidence that it seemed there was a genuine problem related to the drugs themselves.