Men can literally sniff out when a woman is sexually aroused - and find them more attractive when they are - a study has discovered.
In a series of blind tests where men inhaled the scent of a woman's sweat, the same woman was deemed to be more attractive when sexually aroused.
The investigation into carnal lust also found exposure to the chemical signals emanating from female sweat increases the sexual arousal levels of men.
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Heterosexual women watching the erotic film cult film 9 Songs (pictured)became more aroused and their sweat was trapped and sniffed by men anonymously, The women were deemed to be more attractive when aroused
A series of three experiments were carried out to investigate if and how chemical signals from women affected men.
In the study, the researchers write: 'Experiment 1 revealed that men evaluate the axillary [armpit] sweat of sexually aroused women as more attractive, compared to the scent of the same women when not sexually aroused.
'In addition, Experiment 2 showed that exposure to sexual chemosignals increased the men’s sexual arousal.
'Experiment 3 found support for the thesis that exposure to sexual chemosignals would increase sexual motivation.'
For experiment one, a total of eleven heterosexual women with an average age of 19 who were not taking hormonal contraception were enrolled in the study.
Humans can communicate and detect emotions such as fear or sadness through scent.
Sexual arousal is also identified as an emotional physical state.
Previous search has found chemosignals act as a medium through which people can be "emotionally synchronised" outside of conscious awareness.
These effects could very well contribute to the kind of emotional contagion that is often observed in situations involving dense crowds.
They provided sweat samples when aroused and when not aroused one week apart.
For two days prior to each experiment, they were asked to refrain from smoking, drinking alcohol, eating spicy foods or garlic, using deodorant or perfume and having sex to prevent tainting the sample.
Each participant cleaned their underarms with fragrance-free wipes before having absorbent cotton pads taped to their armpits and being given a