What is it that attracts people to each other? Nice hair? Big muscles? Body scent? Recent studies have shown that the cause of such sexual attractions could be airborne chemicals called pheromones, airborne and odorless molecules "emitted by an individual and cause changes in physiology and/or behavior of another individual" .
Pheromones, which have been known to influence sexual activity, aggression, and territory marking. However, whether or not these chemicals affect, or even exist in humans, has been a subject for debate in the scientific community. Since pheromones are not detectable by the human sense of smell, scientists believe that pheromones are sensed by the vomeronasal organ (VNO), part of the olfactory system and located inside the mouth or nose For many years, the existence of the VNO produced much speculation because it had only been found occasionally in adult humans, and when it was found, it was believed to be vestigial. However, in 1985 a study was conducted in which the noses of 100 human adults were examined post-mortem. The VNO was found in the septums of 70% of those examined. Since 1985, much evidence has been gathered to suggest the presence of the VNO in most adult humans.