This article from BBC News claims to prove what many people already suspected was true - that as gregarious humans, we base our assessments - especially our initial assessments - of whether a person is attractive and/or worth getting to know better on how other people act towards them.
There's a fiver in it for anyone who wants to be my groupie. Hours are flexible and I make a great cuppa tea... ;o)
(Update: I've changed the entry requirements. I've decided I'm not fussy whether you're male or female; you just need to be good at being groupies. And willing to clean the house. And you have to know how to use a hoover. And you shouldn't have a fear of heights...)