Mich. Comp. Laws § 750.338a: Gross indecency; female persons.

Sec. 338a.

Any female person who, in public or in private, commits or is a party to the commission of, or any person who procures or attempts to procure the commission by any female person of any act of gross indecency with another female person shall be guilty of a felony, punishable by imprisonment in the state prison for not more than 5 years, or by a fine of not more than $2,500.00, or if such person was at the time of the said offense a sexually delinquent person, may be punishable by imprisonment in the state prison for an indeterminate term, the minimum of which shall be 1 day and the maximum of which shall be life.