Waves a condom at you while pointing at their crotch.
That one made me laugh. Reading the quote you provided prompted me to think of all sorts of body language and non-verbal cues that are more than sufficient in communicating physical consent. Such as him to the bedroom herself, tearing off his clothes or touching him on the penis. But waving a condom at you while pointing at her crotch takes the prize.
Everything I said about consent applies just as much to women as to men. If he's actually uninterested, tearing his clothes off or grabbing his crotch isn't a signal, it's sexual assault.
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.