Video porn pretty much flat out sucks - and not in the way I like it. :) I think that's why literary erotica sales are still so high. Erotica is the one fantasy which everyone is afraid to try to translate properly into the medium of video or film. No 'respectable' actor, director or writer will touch the stuff, unless its couched in so many subtle and artistic touches as to neuter its purpose. Video porn is fantasy done dirt cheap. Usual budgets are, I believe, in the low five figures. Meanwhile a really crappy, low budget, straight to video dog of a 'real' movie will have a budget 100 or even 1000x as much. Western society has a love/hate relationship with sexual fantasies. They sell like crazy, but almost every part of society treats them with disgust and suspicion. So what you get is anonymous people having not very passionate, not very realistic sex.
And that's pretty worthless, as far as I'm concerned. Because I need to know who these people are, and I need a buildup, an entry, a description of what makes their sexual antics exciting and arousing beyond the mere act of the physical. Yes, I like to see attractive women, particularly naked ones, but there needs to be more to it than that. Mind you, video operates at a considerable disadvantage, for it can't explain what's on her mind, can't show you her arousal, her heat and passion, particularly since the actress is rarely capable of demonstrating it without words.
And of course, it's even more impossible with BDSM. The authorities are even more suspicious of this particular genre of erotica.I once had an editor try to explain to me how worried he was about the violence in a book I'd written. The violence was no more than you'd find in any other detective novel, but mine was erotica, and so, even thought none of the violence was sexual in nature, I had to edit it. Video porn/erotic has even more problems in that regard. They have to stay so far away from anything which hints at lack of consent they can't even write a story of seduction. That's why every porn actress drops her clothes the second the male actor touches her. Ever seen one have to be persuaded, convinced, seduced? Not in video! Can't have the female showing any reluctance, because that would hint the male is pressuring her in some way, or not taking 'no' for an answer. So no reluctant, hesitant, uncertain females in porn videos, nosirree! They're all, well, nymphos.No predatory males plotting and planning on how to seduce. Just routine physical acts, with positions changed every thirty seconds for a new camera angle.
Which, I guess, is good for my sales. :-)