Porn, especially how violent it is and how normalised it's become. Millions of people cooming to weird tortures that wouldn't be out of place in the Hostel films or some CIA blacksite, not caring if the people in the videos were forced into it, and now it's not even considered weird to beat or strangle your partner in bed. I'm not exactly prudish, but I like whoever I'm shagging to be enjoying it as well, not crying and begging to stop. And it leads to guys training themselves, like Pavlov's dogs, to respond positively to worse and worse shit until they turn into impotent coomers, serial killers, or troons.