These porn vids give all the wrong ideas, both to aspiring dominants and submissives. Don't get me wrong, i like porn, and these are okay for porn. But as with all porn, some people have a tendency to take it like a guide book. I've seen complaints from the general female population about men cumming on faces (without consent in vanilla relationships). It stems from guys watching porn and taking it to heart, which is about the same as reading Harry Potter and believing a broomstick up your ass can fly you across London.
I think its happening on our side of the world too. People new to the lifestyle often surf the web, looking for 'why am i like this' and 'now that i know i am like this what do i do'? And more often than not the come across the huge amounts of porn on the internet and start watching. Without a guide, a mentor, someone to say 'Hey! Idiot! Things don't work like that.'
What the videos don't show are the large amounts of time, effort, and emotional hard work that it takes to maintain a health D/s relationship. They glorify a girl behind a glory-hole because someone said to, but show how to go from that back to your full time job. Or that as a live in submissive its never really 24.7. Or that you still face communication issues, fights about money, struggling through day to day life. It doesn't show waking up at 4am night after night because he needs something from the next room. It doesn't show scrubbing the dishes, the floors, the toilets, the tub. It also doesn't show the amazingly intense connection that can be found and the need to be held after.
If you wanna watch them for porns sake by all means, i'm all for whatever gets you off. But please don't use any kind of porn as a guide book.