South Park: The Stick of Truth Gets Mature ESRB Rating

I thoroughly enjoy reading through the Entertainment Software Rating Board's rating summaries, particularly when they're for a game as unserious as Obsidian Entertainment's South Park: The Stick of Truth. Of course the RPG has come down with a Mature rating and of course it has plenty of adult humor and strong language, but characters getting anally probed by aliens might be a first:
This is a role-playing adventure game based on the animated South Park TV show. Players assume the role of a new kid in town who embarks on various quests with other boys in the neighborhood. Players can engage in turn-based combat, selecting attacks from a menu screen. Players use various weapons (swords, baseball bats, hammers), magic spells and melee attacks during fights; blood-splatter effects sometimes occur. Cutscenes occasionally depict (cartoony) characters dismembered or decapitated. The game includes several instances of mature humor and sexual material: one extended sequence depicts characters getting anally probed by alien creatures; another sequence (in an abortion clinic) depicts doctors using a vacuum to perform procedures on male characters; one level takes place inside the rectum/colon of a character (sex toys, random objects and fecal matter appear in the level) all sequences are depicted in a cartoony and over-the-top manner. Characters are occasionally depicted nude (e.g., breasts, buttocks, male genitalia); one extended sequence depicts an out-of-focus couple having sex in the background; as players engage in turn-based battle in the foreground, sexual moaning sounds/dialogue is heard. During the course of the game, drug paraphernalia can be seen strewn around a methamphetamine lab. The words (f**k,) (sh*t,) (a*shole,) and (f*ggot) can be heard in the dialogue.