the biggest valid case as to why you shouldn't do one in a game is that incident regarding kilgrave and supergirl doing a rape plot with a jessica jones in game and the clusterfuck that fell on the jones player afterward and all the surrounding plot because of really terrible ooc communication and a few lies. that's basically a textbook example of how not to do one. there have been other ducon/noncon rape threads in games that have gone under the radar more and if you're going to play that, it's how it should be. but when it explodes in a game like that, it's a valid excuse as to why people don't want to be around for that kind of fallout.