Adult entertainment power-house Pink Visual saw visits to its mobile video service soar after Christmas as people turned on new iPhones and tapped into porn.

Sex video makers and distributors are evolving with the technology times, catering to customers seeking satisfaction on smart phones, Blu-ray players and Internet television.

Digital Playground, which is credited with producing the first high-definition adult film five years ago, has a website devoted exclusively to Apple's hot iPhones and offers free trailer "podcasts" for iPods.