I'm kind of mixed on this one..
I mean.. you couldnt have chosen worse examples of what 'Extreme' pornography can be defined as; everything on that list sickens me.
And yes, of course, I understand everyone should be free to choose what they do and enjoy in their own home and all that.. but jeebus man, where do you draw a line in the sand and say "ok, THAT is NOT normal, and WE will not tolerate such because it is a.) disgusting, b.) unnatural, c.) demented, or d.) dangerous?
Sure, choking people during sex might be a great turn on, and being choked might be your thing to rock your socks and all.. but the problem becomes if you actually DIE during the act do to a complication. I'm sure dying isnt something you wanted to do (or maybe you did), but if consent cannot be proved, someone is looking at manslaughter/murder charges and things get awfully complicated from that point.
When I was a kid, i used to like licking the tips of 9 volt batteries for the little 'tingle' it gave my tongue. Of course, this is not acceptable behavior and could harm me. If someone wants to protect me from myself because I lack the capacity or the willpower to do so, I cannot on one hand fault them for the kind effort. On the other hand, if i'm not hurting anybody else, then where is the ethical dilemma?
I think what it comes down to is people do not want to live around other people who have odd tastes as to what they do. It's uncomfortable and in some cases dangerous.
Society makes laws to protect the WHOLE of society, not necessarily the rights of a specific individual that thinks he should be able to make love to dead bodies because it's the only way he finds excitement.
To make society work, we all have to make small sacrifices. Sure, I'd like to drive 200 mph everywhere I go, but the reality is, I have no right to endanger others by doing it. My 'freedoms' only extend so far as they do not harm others.
But Society has rules and we have to accept them sometimes even if we personally do not like them. We live in a Majority Rules system... and if you don't like that, you'll have to simply go somewhere else where YOU are the majority.
That is life.