So what is one of the most popular adult sites. I am always surprised when I hear this but it is Penthouse. I think if you are like me you think of it as old school. Of course they work with all the top adult talent in the business but I think about them more as a magazine. They are still around and apparently doing very well online. They have a really massive archive of quality movies and the quality is outstanding. I guess I always only saw the magazine and never watched one of their porductions. But the truth is it’s probably the most professional I have ever seen.