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A new study has found on May 02, 2014, 17:08 that men and women can subconsciously smell the presence of the opposite sex based on chemical cues that were found and then isolated in human pheromones.
The human body produces chemical cues that communicate gender to members of the opposite sex, researchers said. Whiffs of the active steroid ingredients (androstadienone in males and estratetraenol in females) influence our perceptions of movement as being either more masculine or more feminine, they said.
The effect, which occurs completely without awareness, depends on both our biological sex and our sexual orientations, the study found. Our findings argue for the existence of human sex pheromones. They show that the nose can sniff out gender from body secretions even when we don’t think we smell anything on the conscious level,” said researcher Dr.Wen Zhou of the Academy of Sciences.
Earlier studies have shown that androstadienone, found in male sweat and armpits, can promote a positive mood in females as opposed to males.
Estratetraenol, first identified in female perspiration, has similar effects on males. But it wasn’t clear whether those chemicals were truly acting as sexual cues.
In the new study, Dr. Zhou and her colleagues asked males and females, both heterosexual and homosexual, to watch what are known as point-light walkers (PLWs) move in place on a screen.
PLWs consist of 15 dots representing the 12 major joints in the human body, plus the pelvis, thorax, and head. The task was to decide whether those digitally morphed gaits were more masculine or feminine. Individuals completed that task over a series of days while being exposed to androstadienone, estratetraenol, or a control solution, all of which smelled like cloves.
The results showed that smelling androstadienone systematically biased heterosexual females, but not males, toward perceiving walkers as more masculine. By contrast, smelling estratetraenol systematically biased heterosexual males, but not females, toward perceiving walkers as more feminine.
The researchers found that homosexual males responded to gender pheromones more like heterosexual females did. Bisexual or homosexual female responses to the same scents fell somewhere in between those of heterosexual males and females. When the visual gender cues were extremely ambiguous, smelling androstadienone versus estratetraenol produced about an eight per cent change in gender perception.
* These test studies are the first of its kind results to provide the very first direct evidence that the two human steroids communicate opposite sexual gender information that is differentially effective to the two sex groups based on their sexual orientation and desires researchers said.
Moreover, they demonstrate that human visual gender perception draws on subconscious chemosensory biological cues hence proving the overwhelming effect of human pheromones does indeed exist in all of us.
The study was published in the Cell Press journal Current Biology.