The crime of sexual intercourse or cohabitation between a man and woman who are related to each other within the degrees wherein marriage is prohlblted by law. People v. Stratton, 141 Cal. 604, 75 Pac. 166; State v. Herges, 55 Minn. 464, 57 N. W. 205; Dinkey v. Com., 17 Pa. 129, 5o Am. Dec. 542; Taylor v. State, 110 Ga. 150, 35 S. E. 161