I don’t know how you would study that specifically, but it seems like there’s a lot of evidence that sexual experiences can contribute to formation of fetishes. Iirc there was an experiment on mice or rats or something where they had them wear some sort of structure the first times they mated and then later on they uh, mated more strongly when wearing the thing than when not wearing it (and I think when not wearing it, produced less emissions than rats or mice that had never been made to wear the thing).

I mean, this seems to be a pattern people have seen in many cases?

I seem to recall something about people in the military developing scat fetishes after repeatedly masturbating in restrooms that smell of feces, due to a lack of other private places?

The phrase “fetish fuel” is a fairly standard phrase I think.

Generally, it’s pretty clear that some fetishes come from somewhere. Like, the “woman turns into a giant blueberry” one seems to pretty clearly trace back to someone’s experience with the scene in “Charlie and the Chocolate Factory”.

And, like, if someone starts out looking at/for breast expansion porn, they’re probably going to be exposed to a far bit of lactation porn as well, and I think there’s a fair chance that they’ll start seeking that out as well? For example.

Why would we expect this pattern to not apply in the case of CP/CSAM?