Here's a quick bit of romantic advice, offered up to you absolutely free, courtesy of Hollywood: Don't sleep with your best friend's sister unless you really, really want to mess up your entire life.
Or unless you want to make a highly anticipated indie film, such as "Your Sister's Sister," which just released a new trailer today.
Even then, of course, you'd probably be better off hiring great actors like Emily Blunt, Mark Duplass and Rosemarie Dewitt. And that's just what writer/director Lynn Shelton has done for this look at a guy who has a one night stand with his best friend's sister and then discovers first hand just what a tangled mess a single drunken evening can make of someone's life.
So check out the new trailer, courtesy of Yahoo! Movies. Just remember, these are professionals. Do not try this at home.