The indefatigable "Bonk" author Mary Roach gave an amazingly thorough talk about orgasms at the annual Technology, Entertainment, Design (TED) Talks series for 2009. For example: Sperm that sits around in the body for a week or more may go "bad," so one evolutionary biologist says it's a good excuse for whacking off more often. And you may already know that it takes an average of 20 minutes of clitoral stimulation for women to climax, but did you know that some special ladies can get off on brushing their teeth? Viewer discretion is advised, especially for the pig clip near the end. You'll see.