PG 13 isn't the rule, we have a rule against sexual content. We do not have a rule against gore, violence, etc.
Stuff like this has been removed in the past and probably will continue to. The devs have left in short skirts and ultra cleavage costumes, it's not like you can't make a low poly sex icon without this ingame.
Context is important. People don't get banned over roleplaying nudity, they get banned for trying to make the game into a porno.