The porn industry is betting new advances in the technology can convince more people to pay for the content, since sales of traditional adult video have actually been slowing. Revenue growth among adult and pornographic websites increased at an annualized rate of just 0.3% to $3.3 billion over the five-year period ending in 2015, as the business grapples with high piracy rates and the proliferation of free sites such as PornHub that offer homemade content with few ads, according to IBISWorld Market Research.