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Porn DVD sales are off nearly 50% from their peak in 2006, when they hit nearly $4.3 billion. Reports from the annual Adult Entertainment Expo in Las Vegas confirm the industry is feeling the effects of the economic downturn.

The porn business is going to keep its elbow room. A petition by an AIDS advocacy group to require that adult film companies use condoms when shooting movies has been denied by a Los Angeles judge.

The dirty little secret behind many new technologies is porn. From cinematography to video cassettes and the Internet, pornography has been a key driver of growth. Now, porn is showing up on mobile phones and it's relentlessly wearing down the wireless carrier's bandwidth. In Japan, where...