Common Sense Note
Parents need to know that 21 is a breezy, fact-based drama about college students who use their math skills to count cards in Las Vegas; it may appeal to teens thanks to stars like Jim Sturgess (of Across the Universe) and Kate Bosworth. That said, the subject matter is pretty serious, and there are some fairly violent scenes -- a security officer punches counters with a closed, ring-bedecked fist -- as well as lots of smoking, drinking, swearing, and, of course, gambling. The students also meet up post-gambling at a strip club, and there are plenty of cleavage shots and some passionate clinches.
Strippers do their thing at a club (lots of cleavage shots); Jill propositions Ben, and they make love in front of a window (they're shown from the top half, kissing passionately, naked); mild jokes about masturbation.
A security officer takes delight in beating up anyone caught counting cards; he even wears special rings on his fingers to make the experience more painful (the bloody aftermath is shown on camera). He also flashes a gun, and another gun is fired in a casino. Some loud arguments between friends.
Some salty language, including "goddamn," "bulls--t," and the like.
The students involved in the scheme are aware that what they're doing isn't necessarily playing by the rules, and they seem quite attracted to the rush. They also happily indulge in the spoils, drinking to excess, hooking up with strangers, and throwing money around (one seems to have a shoplifting habit, and fake IDs are used to subvert the authorities and protect the students' true identities). Still, it's clear that, for them, it's not necessarily about total greed (except perhaps for their mentor, Professor Rosa). Also, for Ben, this enterprise is a means to a seemingly noble end: paying for medical school without having to rely on anyone for help. Plus, he comes to an understanding that his game isn't without its cost.
Practically feels like a commercial for Las Vegas, with scene upon scene of casinos, gamblers, and the strip. Signage is everywhere, from the Hard Rock Cafe to Planet Hollywood to The Mirage. A book that teaches the students how to count cards is clearly shown. Shopping sprees take place in stores that are clearly marked out front or by shopping bags, including Louis Vuitton and Gucci. Also many mentions of Google, Sizzler, MIT, Harvard Medical School, etc.
Drugs / Tobacco /
Lots of drinking in Boston pubs and at the Vegas casinos and strip bars. Tons of smoking in those locales as well.