(1)(a) Furnishes to, or uses with, a minor, a police officer posing as a minor or an agent of a police officer posing as a minor, a visual representation or explicit verbal description or narrative account of sexual conduct for the purpose of inducing the minor or purported minor to engage in sexual conduct; OR

(b) Engages in sexual conduct in the immediate presence of a minor for the purpose of inducing the minor to engage in sexual conduct.

(2) A person is not liable to prosecution for violating subsection (1) of this section if the person furnishes or uses a representation, description or account of sexual conduct that forms merely an incidental part of an otherwise nonoffending whole and serves some purpose other than titillation.

(3) In a prosecution under subsection (1) of this section, it is an affirmative defense:

(a) That the representation, description or account was furnished or used for the purpose of psychological or medical treatment and was furnished by a treatment provider or by another person acting on behalf of the treatment provider;

(b) That the defendant had reasonable cause to believe that the person to whom the representation, description or account was furnished or with whom the representation, description or account was used, or the person in the immediate presence of whom the defendant engaged in sexual conduct, was not a minor; OR

(c) That the defendant was less than three years older than the minor or, in the case of a police officer or agent of a police officer posing as a minor, the age of the purported minor as reported to the defendant at the time of the alleged offense.