generation has an employer had a vested right to engage in or to permit sexual harassment; 'there is no such thing as a vested right to do wrong.' Freeborn v. Smith, 69 U.S. 160, 2 Wall. 160, 175, 17 L. Ed. 922 (1865). See also 2 N. Singer, Sutherland on Statutory Construction § 41.04, p. 349 (4th rev. ed. 1986