A woman asks a man for a drink at a bar.

The PUA theory explains this in terms of a status interaction. The woman is testing, 'is this man so low status he feels compelled or obligated to buy me a drink?'

I am wary of explanations based on status interactions. It is the kind of explanation that can explain anything and therefore nothing. Also, I am skeptical based on my sense of the woman's subsequent disappointment and embarrassment if the man says no directly -- this is not a test where the level 1 correct answer is 'no'.

Alternatively, there's the simplistic evolutionary explanation, that I present here as what I would use to explain the phenomenon to a true human-outsider. Asking a man for a drink at a bar covertly or overtly, and in general men buying drinks for women, is the first step in a courtship ritual in which the man is to display that he is a provider. Raising children is a big investment and a family will be successful if the man and the woman together provide for the family. The woman's investment is largely guaranteed by other mechanisms, so it is the male's investment that must be tested and assured.

When a woman asks a man for a drink, this is the modern equivalent of asking him to bring her an animal skin. Something of token value that is of some benefit to her. What happens next is variable and perhaps does depend upon status. The woman can signal that she is not a single-animal-skin female, perhaps because providing for a child is much bigger than a single-animal-skin investment. Alternatively, the female can signal loyalty (her test in the courtship game) and signal that in return for the drink, the man has secured her undivided attention (politely, for at least the length of time it takes her to consume the drink).

This is all level-1 interaction. Human beings are intelligent, and the interaction can go meta to level 2 or 3 or higher. A woman should have concerns about a man that will buy any woman a drink that asks him. If he is too nice (signals too generally that he is a provider) then you can predict he will be fixing Aunt Rosa's faucet when he ought to be changing diapers. Also, he might not be very smart, or too low status in the tribe to provide much for the family. Thus a man that can deflect the request in a humorous/intelligent way will be very attractive -- especially if it is early in the courtship (he will not provide indiscriminately to every female that asks!) and especially if he manipulates the situation to advance the courtship (he is intelligent and capable and interested!).

Level 3 or higher would be the man going meta about the courtship ritual itself. (Not feminist? Or commenting on how silly the norm is.) This can be very attractive because the man is signaling intelligence and a larger meaning-of-life potential value. This is someone you can talk to about whether you should have kids or not.

I would guess that if you are naturally successful with people of the opposite sex, you slide easily and naturally among these levels. PUA seems to recommend making it level 2 or higher. My preference in courtship would be level 1 and level 3 together: the drink and signaling at the meta level about intelligence and gender roles. Because real life is changing diapers, but it's valuable to have a mutual awareness that life is -- to some extent -- a set of choices.

My hunch is that Feynman had success with his rogue tactics because he was meta, and this is what the intelligent women attracted to his intelligence were looking for. His behavior, if given at level 1 or level 2, would flop disastrously.