Women's careers are being held back as men in the United States avoid spending time with female colleagues in the wake of the #MeToo movement, women's rights group LeanIn.org said on Friday.

Nearly two thirds of male managers reported they would be uncomfortable taking part in a common one-on-one work activity with a woman, found a survey by the group and SurveyMonkey, a rise of a third on the number raising such concerns last year.

The findings show women miss out on chances for mentorship and professional links that could lead to promotion, they said.