I can't think of a bias in favor of males. But there are laws requiring certain equality. I do know of a case where a guy protested the dress code at his work (he wasn't allowed to wear shorts) by wearing a short skirt. The company's dress code allowed employees to wear short skirts, and they were not allowed to enforce the dress code differently for men.

Pay and benefits are enforced to be the same. In some states, car insurance companies are not even allowed to give different rates for men vs. women even though statistically women are less risky to insure.