Section 21A. An officer or other person who is employed by or contracts with any penal or correctional institution in the commonwealth, and who, in the course of such employment or contract or as a result thereof, engages in sexual relations with an inmate confined therein, within or outside of such institution, or an inmate who is otherwise under the direct custodial supervision and control of such officer or other person, shall be punished by imprisonment for not more than five years in a state prison or by a fine of $10,000 or both. In a prosecution commenced under this section, an inmate shall be deemed incapable of consent to sexual relations with such person. For purposes of this section, sexual relations shall include intentional, inappropriate contact of a sexual nature, including, but not limited to conduct prohibited by section 22 or 24 of chapter 265 or section 2, 3, 35 or 53A of chapter 272.