Pixar's ability to sneak stuff under the radar is what makes its movies so enjoyable, even when we're way past its usual demographic. Case in point: When Lotso, the pink stuffed bear, takes Mrs. Potato Head's lips off of her body when she's talking too much, Mr. Potato Head says, "Hey, nobody takes my wife's mouth except me!"
As kids, we thought he was just being a protective husband. As adults, all we hear is an oral sex joke.