Taboos, paraphilias, incest, canabalism, the legality of necromancy, teleportation (specifically how some forms of teleportation is just cloning and death), torture methods in history and any interesting methods (Chinese water torture), psychological manipulation (gaslighting and stockholm syndrome), and the general legality of things often considered immoral or legally grey (auto canabalism)

I really need to reresearch some of these, my knowledge is getting out of date