(1) A person who, for the purpose of arousing or gratifying the person’s own sexual desire or the sexual desire of any person, exposes the person’s genitals under circumstances in which the person knows the conduct is likely to cause affront or alarm commits the offense of indecent exposure.

(2) Indecent exposure is a Class C offense, unless the offender has previously been convicted of a sex offense, in which case it shall be a Class D offense.