"So there are 'real' marriage where both partners are fertile, and some other kind of lesser marriage for non-fertile people."

I never said, meant or implied anything like that, GUEST c.g. and I rather doubt if you actually believe I said, meant or implied that.

It's possible to be accurate about points of disagreement, and not just treat discussions as games of conkers. I think it's better to avoid distorting views we disagree with. What's the point in people bellowing out denunciations of stuff the people they are arguing with don't believe? Only too often you get everyone doing that at once in various directions.

I rather like the traditional formal structure in which the idea is you sum up the opponents view, and once that is agreed between the two parties, you then set out to distinguish between points where you agree and points where you disagree.