As Pascal noted 400 years ago: Those who indulge in perversion tell those who are living normal lives that it is they who are deviating from what is natural. They think they are following a natural life themselves. They are like people on a ship who think it is those on shore who are moving away. Language is relative everywhere. But we need a fixed point for those who are moving aboard ship. But in morality, where are we going to find a harbor?
(697-383)Pensees, from The Mind On Fire, page 53,Multnomah Press,1989