>>140723
is well known that parasites affect the host behaviour.
affecting fear and disgust response is one of the more common example, like rabies increase the fear response toward water or toxoplasma increasing risk taking behaviour.
even symbiont like the gut bacteria have a very large effect on the host .
is possible that people partaking in these kinds of fetish are simply more likely to be stricken by parasite, but the opposite sounds very plausible to me.