A pheromone (from Greek φέρω phero "to bear" + hormone from Greek ὁρμή - "impetus") is a secreted or excreted chemical factor that triggers a social response in members of the same species. Pheromones are chemicals capable of acting outside the body of the secreting individual to impact the behavior of the receiving individual. There are alarm pheromones, food trail pheromones, sex pheromones, and many others that affect behavior or physiology. Their use among insects has been particularly well documented. In addition, some vertebrates and plants communicate by using pheromones.
How do pheromones work?
The chemical communication of pheromones is simple. One animal (or human) releases the pheromone and another senses it. In essence, the behavior of the sensing animal is controlled by the pheromone releaser. In mammals, pheromones are detected by an organ called vomeronasal organ (VMO) which is located somewhere in the head between the nose and mouth. Pheromones are a bit like odor molecules but they have a much different effect.
http://www.ehow.com/how_2034434_pheromones-perfume.html
http://www.aphroditewomenshealth.com/news/20020312001807_health_news.shtml
http://www.alpha-dream.com/pheromone_technology_science.php
http://en.wikipedia.org/wiki/Pheromone
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