Researchers at the University of Trier in Germany say that stressed men may be more attracted to members of the opposite sex who look different from themselves. The research results were published in the British "Proceedings of the Biological Branch of the Royal Society" published on the 10th.

The British "Daily Telegraph" said that French President Nicolas Sarkozy and supermodel Carla Bruni, Hollywood actor Tom Cruise and his wife Katie Holmer Douglas, fellow Hollywood stars Michael Douglas and Catherine Zeta-Jones are all celebrity couples with "different" looks. The new experimental results may explain why they look so different.

Previous research results have shown that men and women generally prefer members of the opposite sex who look similar to themselves and feel that such members of the opposite sex are more trustworthy. In addition, men prefer a partner who looks like their mother, while women prefer a partner who looks like their father.

Experiments on mice and flies have shown that stress can change mate preferences, but this has not been done on humans before.

Although the experimental results suggest that men may be more likely to choose women with different looks when under pressure, researchers are not sure whether this is true in real life.

As to why the results of the stress experiment are like this, the researchers said that stress may have stimulated men's desire for "external reproduction", that is, to reproduce with women with different genetic characteristics.

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