indecent liberty

noun2

1. •
   Any behavior beyond the limits of propriety.

   • It would, therefore, hardly be deemed an indecent liberty in the most private citizen, to offer his thoughts to the consideration of the Executive. — 1779
2. •
   Sexual behavior beyond social or legal limits.

   • ... pinching, tickling, rubbing up against, and other forms of contact in places such as elevators and grocery stores may constitute an indecent liberty. — 2004