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A gay pride flag flies during a same-sex marriage demonstration.

Fanning the flames of controversy around gay marriage are questions about what is natural when it comes to sexual orientation. Whether we’re gay, straight or bisexual, how much of who we are in the bedroom is predetermined? Neuroscientist Simon LeVay drags the science behind behavior out of the closet.

Guest:

Simon LeVay, author of Gay, Straight, and the Reason Why: The Science of Sexual Orientation