Exacly Alpha...science doesn't explain everything.
My evidence Cleric, is that love is random Not the best evidence but if it was purely a "chemical reaction" I would be in love with the ugliest woman who walked down the street! Or I would be dumb enough to go with a prositute.
Love is one of those things governored by the goddesses and her son Eros and love happens for a reason, though it also a chemcial reaction.