Inside the "Featured" box on the main Yahoo page is a link to a feature from last year (yeah, there's nothing like fresh content, Yahoo), which asks the question: "How do I avoid getting drowsy after lunch?" The answers are supplied by Yahoo users, not experts. Most are of the "take a nap" or "eat fewer carbs" variety, but toward the bottom of the page was this 10-month-old gem from a user named Antony: "you won't believe it!, but masturbation does work!"
First of all: No, it doesn't.
And Yahoo? You might want to actually read what you're linking to before posting to your main page.
(It's now semi-hidden behind a "This answer has a low rating" link, but it's still there.)