Porn actors and producers have lifted the lid on one of the world's most taboo yet illusive industry's with a series of revealing posts online. 

In a thread on the social network Reddit one user Whiskas2 recently posed the question: 'Porn Actors of Reddit, what is something The viewers REALLY don't know?'It prompted a deluge of responses with almost 3,000 users continuing to comment with some truly fascinating responses.

Some of the most intriguing answers came from CalvinDehaze a former porn producer who provided a long list of myth-busting facts about the adult film industry.

While some of the admissions are too graphic to repeat, the user revealed that not everything is at it seems and that the majority of 'gay porn stars are straight guys.'

The producer went on to explain that most actresses do fake orgasms on camera: 'The women are faking it most of the time. We would try to cast couples or friends who are already intimate with each other.'