There are websites for that. Just look up “parents guide” and the movie title. There are a few different places I use and they are fairly comprehensive, although sometimes their descriptions make things sound worse than they actually are in the movie (“kiss my butt” might be referred to as “sexual innuendo”, which I guess it is, but most parents aren’t going to be super worried about a line of dialogue like that, and when you hear “sexual innuendo” you usually picture something more graphic).