The Iowa Supreme Court has allowed an employer to fire a woman for being too attractive (“irresistible” was the word used).  Now the libertarian position is that voluntary agreements may be terminated by either party; otherwise, they wouldn’t be voluntary agreements. Naturally, this principle appears nowhere in the Court’s decision, since to admit this principle would be to overthrow 75 years of labor law. So they have to come up with the novel argument that the woman’s attractiveness posed a threat to the man’s marriage, and since he was protecting his marriage, his decision was legally acceptable.