Foreign laws contra bonos mores, i. e., laws contrary to the generally recognized standard of morality among civilized nations will not be enforced.

1 The laws of any State in the United States are considered as foreign laws in any other State.

2 By the term forum is meant, according to its use, either the court, or the State or country in which the court is held. 3 Dommert vs. Osborn, 140 N. Y., 30; Milliken vs. Pratt, 125 Mass., 374.

Under this principle polygamous marriages, or marriage between very closely related relations, such as brother and sister, or ancestor and descendant, will not be recognized, even if valid where entered into, in spite of the general principle that a marriage valid where entered into is good anywhere.