Emotional attraction is still a bit ambiguous certainly, but then so is 'Love"
PET gives a measurement to various emotions.
An 'emotion' triggers activity in the brain.
Neutral emotion was distinguishable in the prefrontal cortex, thalamus, hypothalamus and midbrain.
Unpleasant emotion in areas such as bilateral occipito-temporal cortex, cerebellum, left parahippocampal gyrus, hippocampus, and amygdala.
Pleasant was isolated from nuetral but not from unpleasant in the left caudate nucleus.
Ref: Neuroanatomical correlates of pleasant and unpleasant emotion 1997,
http://psyphz.psych.wisc.edu/web/pubs/1997/neuroanat_pleasant_unpleasant.pdf