Women who date sexist men often become sexist themselves, new research suggests.
A study, led by social psychologist Matthew Hammond from the University of Illinois, examined more than 1000 couples in North America and New Zealand.
It involved couples aged 17-48 who had been together for an average of almost three years.
A man's attitude toward sexism was found to play a "distinct and unique role" in shaping his partner's views. It can take less than a year for the influence to show, the research found.
Women in the study were asked to categorise their own sexism and their other half's sexism.