There’s still some off color words in the studio version of Grease’s soundtrack. The Catholic school I went to wouldn’t let Greased Lightin’ from the record be used for a student talent content performance.
And I rewatched both films for the first time in about 35 year. The second one has much more raunch in it and more of a rapey scene where the guys try to get a girl to give it up by playing an air raid siren outside of a bomb shelter.
See my reply to jotmo below for a whole lot more Grease lore.