After reading the article, I am not convinced, we should copy the techniques employed by porn sites when building all "ordinary" sites. On a porn site, the content variability is low - it is easy to pick one video, promote it, and it would probably satisfy all viewers to some degree. On a normal site, each user wants something else and pushing one video may annoy 90% of viewers, because it is not what they are looking for. On a less emotional and more informative site, you have to be less pushy.