We might perceive attraction as a free choice, but scientists have provided a number of different explanations about how attraction happens. Physiological theories can be divided into evolutionary explanations, which are based on primitive instincts to mate and be looked after, and biological explanations, which examine the role of hormones and neurotransmitters in the process of attraction. Other explanations focus on psychological concepts such as perceived similarity, while social explanations examine the role that vicinity and experience can play in attraction. (With thanks to our sponsor 'Curriculum Press' for providing content for this podcast)