Cal. Penal Code § 266g

Every man who, by force, intimidation, threats, persuasion, promises, or any other means, places or leaves, or procures any other person or persons to place or leave, his wife in a house of prostitution, or connives at or consents to, or permits, the placing or leaving of his wife in a house of prostitution, or allows or permits her to remain therein, is guilty of a felony and punishable by imprisonment pursuant to subdivision (h) of Section 1170 for two, three or four years; and in all prosecutions under this section a wife is a competent witness against her husband.