What parents need to know
Parents need to know that Don Jon is about a guy (Joseph Gordon-Levitt) who's addicted to porn, which means it has lots of montages from X-rated movies. No genitalia are shown, but you'll see plenty of naked breasts, graphic sex scenes (with genitals obscured), moaning, groaning, people in all sorts of positions, and implied masturbation. There's tons of swearing/crude language, too (including "f--k" and "s--t"), and one scene in which a character smokes weed. All of that said, mature viewers can still learn something from the movie, including that pornography can shape the way people/society views women and of sex -- and that it can get in the way of true intimacy.