Section 263.20. Sexual performance by a child; affirmative defenses

1.  Under  this  article,  it shall be an affirmative defense that the
  defendant in good faith reasonably believed the person appearing in  the
  performance  was,  for  purposes  of  section  263.11  or 263.16 of this
  article, sixteen years of age  or  over  or,  for  purposes  of  section
  263.05,  263.10  or  263.15  of  this article, seventeen years of age or
  over.
    2. In any prosecution for any offense pursuant to this article, it  is
  an  affirmative  defense  that  the  person  so  charged was a librarian
  engaged in the  normal  course  of  his  employment,  a  motion  picture
  projectionist,  stage  employee or spotlight operator, cashier, doorman,
  usher, candy stand attendant, porter or in any other  non-managerial  or
  non-supervisory capacity in a motion picture theatre; provided he has no
  financial interest, other than his employment, which employment does not
  encompass  compensation based upon any proportion of the gross receipts,
  in the promotion of a sexual performance for sale, rental or  exhibition
  or   in   the   promotion,  presentation  or  direction  of  any  sexual
  performance, or is in any way responsible for  acquiring  such  material
  for sale, rental or exhibition.