Every major p 0 r no production company and magazine is required by law to test any participants that have sex with more than one person in four months. And if you believe everything you read off the internet, it's no wonder you are all so one sided. If you wnt to read a book read "The Laws That Keep Me Straight" By Greg Williams, a true p 0 r n star. Or read any interviews or articles with Ron Jaremy.
Furthermore, and to the rest of yo, I'm well aware of how long any scene takes to shoot, and that it is extremely inaccurate, but it's aimed at men, so what are you going to do?