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One possibility is that it is a learned behavior that evolved from kiss feeding, the process by which mothers in some cultures feed their babies by passing masticated food from mouth-to-mouth. However, there are some contemporary indigenous cultures which still practice kiss feeding, but not social or erotic kissing.
The reason for the kiss in the video was to convey the switching of sides. Halle begins as the doctor and Durst as the patient, but then they kiss and then she's the one in Dursts previous position. She is now behind his eyes so to speak, and he is in hers.