I can see your point. However, it is a linguistic battle already lost. I just searched "torture porn" at Google and all 100 of the first 100 results are references to horror movies and none genuine torture porn. Even combining "torture porn" with BDSM finds a fair number that are still talking about horror movies when they use the phrase.
That's the drawback of being an extremely niche mostly underground marketplace. The mainstream isn't going to take any notice of linguistic priority when it comes time to hand out the new labels.
And I don't know about rollercoasters but there is porn out there where specific fabrics plays a key role. Particularly silk and velvet.
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