Why is explicit negotiation, as opposed to say 'looking for what your partner seems to respond better to', important on this topic? Lots of people cannot or do not want to verbalize what they like when it comes to relationship behaviors.
Exactly. Interacting with your partner, even implicitly, is a form of negotiation and communication.
Clarisse Thorn recently posted a useful article about Ethical Pick-Up Artistry, bringing up a few basic critiques of traditional PUA and suggesting a few alternatives.
A proposal to formalize thisNot the same thing, but a discussion on forming a community to practice social artistry in general has been brought up on LW before, but I'm not personally aware of anything coming out of that.