Ind. Code § 35-45-4-1.5
(d) A person who knowingly or intentionally appears in a state of nudity:
(3) with the intent to arouse the sexual desires of the person or another person, in a department of natural resources owned or managed property;
commits a Class A misdemeanor. However, the offense is a Level 6 felony if the person has a prior unrelated conviction under this subsection or under subsection (c).
As added by P.L.123-2003, SEC.3. Amended by P.L.158-2013, SEC.525.