In fact, that finding allowed scientists to figure out recently why the males of some species of birds did not appear to have brighter plumage than the females, Dr. Neitz said.

奈茨博士说，事实上，这项发现使科学家最近弄清了为什么对某些鸟类，雄性羽毛似乎不如雌性鲜艳。

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While 82 percent of females questioned said telling a lie ate away at their conscience, only 70 percent of men confessed to pangs of guilt.

调查还显示，82%的女性认为说谎“让良心过不去”，而只有70%男性承认谎后有罪恶感。

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The results suggest the reason why males of other species die faster than females may be the stress and strain of competition, the authors said.

研究还揭示出，在其他物种中雄性比雌性早死的原因可能是竞争的压力过大。

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The bear's name comes from the system of identifying bears from that Italian population, with M standing for males and F for females, said WWF spokesman Philip Gehri.

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But the authors of the paper in Current Biology said females, particularly adolescent females, and young chimps in general were seen exhibiting this behaviour more frequently than adult males.

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With the help of a counselor, a person with these issues would perhaps have to look into his own sexual past, as well as the relationship of his parents, to examine what might influence the way he relates to females, Neuman said.

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