Defenses to sexual abuse of a ward, patient, or client.

(a) Consent is not a defense to a prosecution under §§ 22-3013 to 22-3016 , prosecuted alone or in conjunction with charges under § 22-3018 . (b) That the defendant and victim were married or in a domestic partnership at the time of the offense is a defense, which the defendant must prove by a preponderance of the evidence, to a prosecution under §§ 22-3013 to 22-3016 , prosecuted alone or in conjunction with charges under § 22-3018 .