When Homer forgets her birthday and is forced to improvise, he buys a bowling ball with his name on it. Bart Snaps Homer In A Compromising Position In ‘Homer’s Night Out’. Coincidentally, Marge takes Bart, Lisa and Maggie to the same restaurant, but to a different part.
The adult version of Bart is an adult doppelganger of Bart Simpson.
However in my opinon, I don't think The Simpsons lumps into this category, totally WTF version of it such as the Douche and Turd thing, The Simpsons is So really, I dont see why The Simpsons is considered adult comedy.
Adults/Kids is a song performed by a group of kids and a group of adults to conclude the episode "Wild Barts Can't Be Broken". It is a parody of the song " Kids".
Long before there were mainstream adult cartoons on network TV, The Simpsons was one of the first cartoon shows that parents opposed because of racy jokes.