Two chemical reactions associated with falling in love are increases in oxytocin and vasopressin;[8] and Elisabeth Young-Bruehl has suggested that "when we fall in love we are falling into a stream of naturally occurring amphetamines running through the emotional centres of our very own brains".[9] With regard to sociobiology, it is stressed that mate selection cannot be left to the head alone[10] and must require complex neurochemical support.[11]
Critics of such Neo-Darwinism point out that over-simplistic physical arguments obscure the way sexual passion often leads not to secure attachment but to attachments thwarted, as well as the sheer frightening difficulties of all falling in love.[12]
Biologist Jeremy Griffith suggests that people fall in love in order to abandon themselves to the dream of an ideal state (being one free of the human condition).[citation needed]
