Mich. Comp. Laws § 722.672

Sec. 2. As used in this part: (a) "Nudity" means the lewd display of the human male or female genitals or pubic area. (b) "Sexual excitement" means the condition of human male or female genitals when in a state of sexual stimulation or arousal. (c) "Erotic fondling" means touching a person's clothed or unclothed genitals, pubic area, buttocks, or, if the person is female, breasts, for the purpose of sexual gratification or stimulation. (d) "Sadomasochistic abuse" means either of the following: (i) Flagellation, or torture, for sexual stimulation or gratification, by or upon a person who is nude or clad only in undergarments or in a revealing or bizarre costume. (ii) The condition of being fettered, bound, or otherwise physically restrained for sexual stimulation or gratification, of a person who is nude or clad only in undergarments or in a revealing or bizarre costume. (e) "Sexual intercourse" means intercourse, real or simulated, whether genital-genital, oral-genital, anal-genital, or oral-anal, whether between persons of the same or opposite sex or between a human and an animal.