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Using a brain imaging technique, Swedish researchers have shown that gay and straight men respond differently to two odors that may be involved in sexual arousal, and that the gay men respond in the same way as women. The new research may open the way to studying human pheromones and provide a biological basis for sexual orientation. Pheromones, which are chemicals given off by one individual to stir some behavior in another of the same species, are known to govern sexual activity in animals.

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Love changes everything, people say. Especially on that day, pheromones are advertised and sold as cologne or perfume in order to stimulate attraction between people. However, the question is: do sexual pheromones really exist, and how good are they?

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The scientists from the Chinese Academy of Sciences sought to test recent evidence that people are influenced by sex pheromones in their sexual interactions with others. They focused on assessing if two particular steroids, androstadienone found in male sweat and estratetraenol in female urinecould be classed as sex pheromones by examining whether their smells unconsciously communicate gender information. They showed men and women animations of non-gender specific outlines of walking figures while dosing them with the two steroids.

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Especially nowadays, pheromones are advertised and sold as cologne or perfume in order to stimulate attraction between people. However, the question is: do sexual pheromones really exist, and how good are they? Pheromones are chemosignals transmitting gender-specific information. There are higher concentrations of AND in male than in female axillary sweat.

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The testosterone derivative 4,androstadienone AND and the estrogen-like steroid estra-1,3,5 10 ,tetraenol EST are candidate compounds for human pheromones. In a previous positron emission tomography study, we found that smelling AND and EST activated regions covering sexually dimorphic nuclei of the anterior hypothalamus, and that this activation was differentiated with respect to sex and compound. In the present study, the pattern of activation induced by AND and EST was compared among homosexual men, heterosexual men, and heterosexual women.

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By Jennifer Viegas. Smelling a male pheromone prompts the same brain activity in homosexual men as it does in heterosexual women, a new study has found. It did not excite the sex-related region in the brains of heterosexual males, although an oestrogen-derived compound found in female urine did.

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Not So Str8's range of pheromone-charged body wash and hair styling products might help you get lucky. Using a blend of custom pheromones in all of their products called pherottraction, the brand aims to boost your senses and confidence, while stimulating those you are trying to attract—in this case, persons of the same sex. How does this work?

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Support for the idea of human sex pheromones. IT IS every perfume-maker's dream to find a spray that plugs straight into the hypothalamus—the part of the brain responsible for libido. Unfortunately, evidence for such brain-manipulating chemicals in humans is inconclusive. But it is not non-existent.

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Homosexual people have a nose for each other, according to new research published in Psychological Science. Scientists in Philadelphia collected samples of underarm sweat from 24 donors of "varied gender and sexual orientation" and then asked 82 heterosexual and homosexual men and women to test these for any potential appealing qualities. Homosexual men and lesbian women showed preferences that were not those of heterosexual people of either sex.

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The sight of someone in tears might make you feel concerned. But the smell of tears, researchers say, has a different effect. Apparently the tears sent a message that romance was off the table. This study offers some of the most recent evidence that people perceive all sorts of interesting things about one another through olfaction.

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