One beheading, many stabbings and a sleet of gore. The sex act is continually flaunted and discussed and partially performed. Genitals are on view. Vulgarity is celebrated in all forms, from the sexual to the intestinal, with an emphasis on bowels.
Drugs are heavily in use and there are leaden racial jibes and stereotyping.
If they haven't seen it already, resist. Unless uninterested or dissuaded, they have definitely seen it already. But let's not get ahead of ourselves. Late one night a pretty, vacant high school miss answers the telephone and with a nervous titter indicates to the caller that she is not quite dumb enough to tell him all about herself. He then tells her he wants to look at her insides.