In the 1990s I happened upon a game of Vampire (a live-action role-playing game) being played outdoors at night on the campus of UC Berkeley. After the game, I happened to be sitting around at Durant Food Court (a cluster of restaurants near campus) when I overheard one of the female players throw herself at one of the organizers: "How many experience points would I need to go to bed with you?" she asked playfully. (The organizer threw me a juicy grin on the side a few moments later, which I took as confirmation that the offer was genuine.)

I am guessing that in the environment of evolutionary adaptation, political success and political advantage consisted largely of things very much like being able to get a dozen people to spend an evening in some organized activity that you run.

ADDED. Now that I have had time to reflect, what she probably said is, "how many experience points do I get for . . .", which is a wittier come-on than the one I originally wrote and which jibes with the fact that one of the organizer's jobs during the game is to award experience points to players.