Zoology blogger Camila Ruz explores research into the role of a cluster of genes called the MHC, or major histocompatibility complex.
She is joined by Dr Leslie Knapp from the University of Cambridge to hear how the clue to whether we will find a prospective mate attractive may be in their smell.
Dr Craig Roberts from the University of Stirling explains how the contraceptive pill may be changing our behaviour, and Dr Nicholas Hole from the University of Durham flags up some of the consequences of going against your evolutionary preferences.
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