Women Pick Up Body Odour Better
Women may be better at sniffing out biologically relevant information from underarm sweat, a US study suggests.
Researchers found it was difficult to mask underarm odour when a woman was doing the smelling, but quite easy to do so when it was a man.
They speculate that a woman's highly attuned smell radar might help her select a mate.
The study, by Philadelphia's Monell Center, appears in Flavour and Fragrance Journal.
In the study, women and men rated the strength of underarm odours, both alone and in conjunction with various fragrances.
The fragrances were selected to test their ability to block underarm odour through a method known as olfactory cross-adaptation.
This occurs when the nose adapts to one odour, and then also becomes less sensitive to a second odour.
Sniffed alone, the underarm odours smelled equally strong to men and women.
But when fragrance was introduced, only two of 32 scents successfully blocked underarm odour when women were doing the smelling.
In contrast，19 fragrances significantly reduced the strength of underarm odour for men.
Lead researcher Dr Charles Wysocki, a behavioural neuroscientist, said: "Taken together, our studies indicate that human sweat conveys information that is of particular importance to females.
Not only were women better smellers than men, but male odours were harder to block than female odours.
Underarm odours from the two sexes did not differ in how strong they smelled. However 19% of the fragrances successfully reduced the strength of male underarm odour, compared to over 50% for the female equivalent.
Dr Leslie Knapp, an expert in biological anthropology at the University of Cambridge, said there were good evolutionary reasons why a woman's ability to detect body odours should be more acute could literally be an effective way to sniff out a suitable mate.
She said: "Women perhaps need to be more discriminating when they choose who to mate with to produce offspring, as they invest more than males in the reproductive process.
"Men don't need to be so choosy，they have lots of sperm, and can reproduce with lots of females, but once a woman reproduces with a partner she is tied up for nine months."
Dr Knapp said there was evidence that odour gave a hint about genetic make-up. She highlighted HLA genes involved in the immune response.
She said in evolutionary terms it was desirable for a women to mate with a man whose genes were different from hers, as this was likely to produce more robust offspring.
1. Researchers found it was difficult to mask underarm odour when a woman was doing the smelling, but quite easy to do so when it was a man.
本句是一个复合句。 found后面是省略了引导词的宾语从句，作found的宾语。其中it是形式主语，真正的主语是后面的不定式短语to mask underarm odour。后面两个when分别引导两个时间状语从句。
2. Dr Leslie Knapp, an expert in biological anthropology at the University of Cambridge, said there were good evolutionary reasons why a woman's ability to detect body odours should be more acute could literally be an effective way to sniff out a suitable mate.
本句是一个复合句。 an expert...Cambridge是Dr Leslie Knapp的同位语。 Said后面是省略了引导词的宾语从句，充当said的宾语。其中why引导限制性定语从句，修饰reasongs。 as引导原因状语从句
3. She said in evolutionary terms it was desirable for a women to mate with a man whose genes were different from hers, as this was likely to produce more robust offspring.
本句是一个复合句，said后面是省略了引导词的宾语从句，充当said的宾语。其中it是形式主语，真正的主语是后面的不定式短语to mate with a man. whose引导定语从句，修饰man. as引导原因状语从句。
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