I guess we must think of how the devs would feel about the reverse situation, that sexual and non-sexual be simply called nudity. In this case no appealling would ever be done! I'm trying to constructively think as to what the devs might have done different to meet the same goals, but please us. 1/

Training an AI towards making the distinction a priori rather than use actual data is a good point, but you also need real world observation of humans putting context via their collective judgement, rather than a small room of devs with personal prejudice leanings. 2/