>>79853683They want to be seen as the "cool" parent and don't stop to think that maaaaaybe you might want to hold off on it until they're older and actually understand what sex fucking is in the first place before they get blasted by raunchy sex jokes in every other line of dialogue.
They have zero context in life to process any of what they're going to see joked about and presented other than the spectacle, so they're just going to repeat what they hear and model what they see, again, without context, and have a completely fucked up picture about what adult behavior is actually expected to be.
When kids sneak these movies, they understand at least that what they're seeing isn't really socially acceptable and they shouldn't go around parading that fact unless they want their hide tanned by a parent. When a parent TAKES THEM to go see it, you are implicit in condoning what they are going to see in the movie. The kids take completely the WRONG context from how its presented.