And... in answer to your main thread question...
Porn... least as we know it.. is losing it's shock value or "mystery" value every day. The more folks are familiar with it - the less impression it makes.
That in turn means some webmasters push the boat out to extremes to maintain their sales appeal.
The flip side is... there is a market for even very "tame" porn - and that never seems to have changed over the last few decades - so who knows?