The findings add to previous research about masculinity and offer further insight into what people look for in others when choosing potential partners, said evolutionary psychologist Lynda Boothroyd, who led the study.
"What I've shown is that when people look at masculine faces they see them as being associated with dominance -- which is a good thing in evolution but less good as a long-term partner," she said in a telephone interview.
In the study, published in the journal Personality and Individual Differences, the researchers asked more than 400 British men and women to judge digitally altered pictures of male faces made to look more masculine or feminine.