It was once too taboo to talk about, but not anymore. In the new CNBC original production "Porn: Business of Pleasure" nothing is off limits when it comes to the controversial multi-billion dollar industry that aims to please but has been known to offend.

The porn industry has changed technology and can be found in millions of homes, hotel rooms and hard drives across the country. BUT, the business is facing economic challenges. It's under assault and not just from the many critics who see it as socially corroding, degrading to women and a risk to the young.

CNBC takes an unprecedented behind-the-scenes look inside the multibillion dollar pornography business, from the threats to its profitability to exclusive behind-the-scenes interviews with the industry's biggest stars to the one issue that could bring the adult industry to it's knees. CNBC's Melissa Lee reports on "PORN: BUSINESS OF PLEASURE."