(Be warned: This is quite lengthy) It's an essay from a Buffy related book once again credited to 'Imblack21' for her find. The girls becoming a b/a santa!
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Buffy the Vampire Slayer and Philosophy
Fear and Trembling in Sunnydale

The essay in question:

Buffy in the Buffy:
A Slayer's Solution to Aristotle's amor Paradox
Melissa M. Milavec and Sharon M. Kaye

Background from the essay...

The Aristotelian Framework

According to Aristotle, there are three levels of friendship. The lowest form, "utility friendship", is based on mutual benefit, irrespective of whether o not two parties...