I haven't been advocating cultural or moral relativism. I've been arguing against it.
Each person defines a particular value as progress or regress by weighing up what they see as the merits and demerits of them. What the criteria is depends on what you're talking about, and these are often derived from a common system of meta-values or universal principles, such as religion or social darwinism or secular humanism.
Whatever the system, whatever values a person regards as superior or inferior, it's more intellectually honest to express an opinion than to be so abstract as to say all systems of thought and all acts can be spoken of as equal. I really don't think anyone really views the world in such terms when it comes down to the nitty-gritty of the real world.
Basically, deep down, everyone has an opinion on the rightness and wrongness of murder, gay marriage, gun control, abortion, charity when it impacts their own lives, so to talk about them as if all things are equal is a cop-out.
Anyway, I dislike getting into lengthy multi-page threads full of quotes, and somehow I've ended up in one again. I've made my point - whatever the kink involved, a reckless disregard for safety is stupidity or insanity. Pornography should be safe, sane and consensual.