Massachusetts General Laws ch. 151B, §4:

It shall be an unlawful practice:

1. For an employer, by himself or his agent, because of the . . . sexual orientation, which shall not include persons whose sexual orientation involves minor children as the sex object, . . . of any individual to refuse to hire or employ or to bar or to discharge from employment such individual or to discriminate against such individual in compensation or in terms, conditions or privileges of employment, unless based upon a bona fide occupational qualification.