I myself have never really had much of a problem with 'adult content' in my games, outside of coarse language and violence, which are part of the game. Constant battle and slaughter is what almost all rpg's are all about, after all. As far as sexual content, I do think that in most cases it just makes the game a bit immature (unless that's the over/underlying theme of the adventure).
However there are points where ti can have a lot of merit in conjecture with certain circumstances, as RotatingPanda pointed out with the Slaaneshi cultist.
In the end, it's not our choice to make on the site's ruling. As stated previously, it's the owners of MW who make the final judgement. We deal with it, or we move on elsewhere