For a subject that's so popular, sex is something most people have a hard time discussing. This is especially true in Hollywood movies, where it's usually treated as exciting (9 1/2 Weeks) or dangerous (Basic Instinct) but rarely realistically. Even when sex is taken seriously, like in last year's addiction drama…

Somewhere in the world, maybe in a dusty old rotting liberal-arts faculty lounge, maybe in the office where they make that McSweeney's-Grantland Quarterly thing, someone is really excited about The Best Exotic Marigold Hotel. It's a "light" comedy opening Friday that stars Judi Dench, Bill Nighy, Maggie Smith and Tom…