(1) "Sexual performance" means any performance or part thereof that includes sexual conduct by a child younger than 18 years of age.

(2) "Sexual conduct" means actual or simulated sexual intercourse, deviate sexual intercourse, sexual bestiality, masturbation, sado-masochistic abuse, or lewd exhibition of the genitals.

(3) "Performance" means any play, motion picture, photograph, dance, or other visual representation that can be exhibited before an audience of one or more persons.

(4) "Produce" with respect to a sexual performance includes any conduct that directly contributes to the creation or manufacture of the sexual performance.

(5) "Promote" means to procure, manufacture, issue, sell, give, provide, lend, mail, deliver, transfer, transmit, publish, distribute, circulate, disseminate, present, exhibit, or advertise or to offer or agree to do any of the above.

(6) "Simulated" means the explicit depiction of sexual conduct that creates the appearance of actual sexual conduct and during which a person engaging in the conduct exhibits any uncovered portion of the breasts, genitals, or buttocks.

(7) "Deviate sexual intercourse" has the meaning defined by Section 43.01.

(b) A person commits an offense if, knowing the character and content thereof, he employs, authorizes, or induces a child younger than 18 years of age to engage in sexual conduct or a sexual performance. A parent or legal guardian or custodian of a child younger than 18 years of age commits an offense if he consents to the participation by the child in a sexual performance.

(c) An offense under Subsection (b) is a felony of the second degree.

(d) A person commits an offense if, knowing the character and content of the material, he produces, directs, or promotes a performance that includes sexual conduct by a child younger than 18 years of age.

(e) An offense under Subsection (d) is a felony of the third degree.

(f) It is an affirmative defense to a prosecution under this section that:

(1) the defendant, in good faith, reasonably believed that the child who engaged in the sexual conduct was 18 years of age or older;

(2) the defendant was the spouse of the child at the time of the offense;

(3) the conduct was for a bona fide educational, medical, psychological, psychiatric, judicial, law enforcement, or legislative purpose; or

(4) the defendant is not more than two years older than the child.

(g) When it becomes necessary for the purposes of this section or Section 43.26 to determine whether a child who participated in sexual conduct was younger than 18 years of age, the court or jury may make this determination by any of the following methods:

(1) personal inspection of the child;

(2) inspection of the photograph or motion picture that shows the child engaging in the sexual performance;

(3) oral testimony by a witness to the sexual performance as to the age of the child based on the child's appearance at the time;

(4) expert medical testimony based on the appearance of the child engaging in the sexual performance; or

(5) any other method authorized by law or by the rules of evidence at common law.