By Kate Devlin, Medical Correspondent 6:30AM GMT 18 Nov 2009
Men are more predictable than women, but the trait helps them to find a partner, scientists believe.
Whether it is being loud or quiet, males are more likely to find their defining characteristics early and stick with them.
Females, by contrast, are more changeable and likely to adapt their behaviour to circumstances, according to researchers.
But they appreciate consistency in their partner, a review of studies analysing humans and the animal kingdom dating back more than 30 years shows.
Dr Wiebke Schuett, from the University of Exeter, who led the study, said: “Our study suggests that, while males tend to exhibit more pronounced personalities, including more predictable behaviour, in a range of different contexts, females are more receptive to these traits in males.