Director Nick Cassavetes -- I'm OK with Incest!

Writer/director Nick Cassavetes supports the phrase "If you can't keep it in your pants, keep it in the family" ... claiming there's nothing wrong with a little incest.

Cassavetes, whose new film "Yellow" features a brother/sister relationship, compared the taboo act to gay marriage while promoting the movie in Toronto this weekend.

Cassavetes explained, "Who gives a s**t if people judge you? I'm not saying this is an absolute but in a way, if you're not having kids -- who gives a damn? Love who you want. Isn't that what we say? Gay marriage -- love who you want?"

On a related note, here's a photo of Angelina Jolie kissing her brother on the mouth 12 years ago.