It could be that a large amount of porn consumption is kept as a private thing, but when sex scenes appear in media that is consumed "in public" (theatres, on t

It could be that a large amount of porn consumption is kept as a private thing, but when sex scenes appear in media that is consumed "in public" (theatres, on the living room couch with friends, etc.) any reminder of that private life might cause anxiety about sexual preferences being found out by others. So the natural inclination is to react as strongly as the rest of the people against such scenes to avoid standing out. Also, maybe such prudishness could also publicly channel negative thoughts about the private porn consumption in an indirect way, in a "that's not really me" sense. I'm speculating here since porn is easier to hide the consumption of entirely unlike something like drugs. A more sympathetic reaction towards such scenes could be unconsciously seen as as much as a giveaway as a razor with mystery powder on it.