1. Rape is prohibited. End of story, not graphic depictions of it, and not even mentioned as happening "offscreen" (at the very most as an unspoken implication to the backstory of a half-orc or tiefling, but never explicitly said as much, and even then that's pushing it). It's not funny: it's tasteless, and it sucks the entertainment right out of the game to even consider it.
2. Child abuse is completely prohibited. Goes triple if my wife is in the game: she was abused as a small child and still has issues related to it. In one of my first campaigns ever (as a player) I saw a fellow player take sick pleasure at describing how his death priest was viciously torturing and slaying a small child (that turned out to be his younger self thanks to some time travel). The DM set up the encounter as a chance for this ostensibly CN character to do a good deed and avoid slipping to CE because the character had been played as very dark and doing a lot of questionable acts, thanks to the reveal that it was actually himself as a child, the character wiped out his own existence and disappeared. . .and the player was not invited to make another character. It was well over a decade ago and I still get kind of sick thinking about that entire incident.