"Sex plus" refers to policies or practices by which an employer classifies employees on the basis of sex plus another characteristic, such as marital status, race, or age. In such a case, an employer does not discriminate against all women, but a specific subclass of women (such as women with children, women over a certain age, or women of a certain ethnic background).
To bring a viable "sex plus" discrimination claim against an employer, you must show that one of the following is true: