Britney Spears in Playboy, Vanessa Hudgens nude: How naked stars earn money -- even when they're not

Britney Spears, it turns out, won't be posing for Playboy -- she's reconsidering the idea with her rather imperfect post-baby body, and according to the National Ledger, she's now only worth $400,000 to Hugh Hefner. She won't take less than seven figures (note she was offered $2 million several years ago). Even with her clothes on, however, everyone's favorite has-been is still making cash over the barrelhead.

Nope, it won't go into her kids' college fund; she's not making the money. Time Warner Inc. (NYSE: TWX), News Corp. (NYSE: NWS), Yahoo! Inc. (NASDAQ: YHOO), and just about every company that covers the entertainment industry is making money just for the idea. It may have been a mistake for Vanessa Hudgens to let a nude photo of herself bounce around the internet, but it's hardly a blow to Walt Disney Co. (NYSE: DIS), for whom she stars in movie after movie after teen musical movie. In fact, she's the biggest search term on the internet today.

It's not about sex or nudity or retouched photos: it's about Googling for them. Your two- and three-word search phrases (even the misspelled ones) may not take you to NSFW web sites. But they're working overtime for the companies who serve up the content. If you're reading this post right now? You're making money for Time Warner, just looking at those ads. The amazing fact about media: sex sells, even when no one's having any.