Livre d'Or

Actaully, I have a bit of a rant about the way the human brain recognises which partners are taboo in that sense
There's me picking my analogies with care. Though I'm not sure anyone else but rysmiel is reading this by now, so I'm probably not going to collect reactions as I'd hoped.

a word/rule mechanism, similar to that which Steven Pinker proposes for verb evolution
I really need to read Pinker, I've heard his arguments summarized by so many more or less reliable sources that it's getting ridiculous!

there is a mechanism there which to my mind would be worth understanding, which nobody seems to have done any professional work on, and which is damn near impossible to talk about
Ugh. Yes, I can quite see that. It's a sort of subset of the 'brain thinking about itself' problem, but a particularly intractable subset.