law: 91. Behaving indecently in public.-
  No person shall wilfully and indecently expose his person in any street or public place or place of public resort or within sight of, and in such manner as to be seen from, any street or public place or place of public resort, whether from within any house or building or not, or use indecent language or behave indecently or riotously or in a disorderly manner in a street or public place or place of public resort or in any office, police station or station house.