Researcher: The role of chemicals called pheromones in determining the sexual behavior of some animals is well documented  But, even though humans also produce these chemicals, it is clear that psychological factors have taken over this role in us  Whereas for animals these behaviors are involuntary, which is a clear sign of chemical control, humans, by virtue of their free will, choose how they behave, and thus psychological factors take over
So pheromones are merely a vestige of our evolutionary past
whatever does not have a chemical explanation must have a purely psychological one