Depends on the level of budget those films have. At some point, those who buy adult films for the class and quality of filmmaking have some sort of problem. The whole point of watching adult films is to see people go at it (whether with themselves or with others). Some directors, like Michael Ninn and Andrew Blake, pride themselves in using slow-motion capture scenes - a far cry from the gonzo films of Seymour Butts and others. But, no matter what kind of directing approach you take to the adult film industry, in many ways it will sell...of course, depending on the actresses you use, and/or the level of hardcore, at which you film.
Mayhaps this makes me seem like a real perv, but the adult film industry is just like Hollywood or Bollywood. There are genres, there are big names, and there are different ways of making money.
"I like refried beans. That's why I want to try fried beans, because maybe they're just as good, and we're just wasting time." - Mitch Hedberg (1968-2005)
"Football is about if you want to run and fight for each other, if you really want to play that killer ball." - Robin van Persie, Arsenal FC