The tribe of Orcs were quite satisfied with their newest slave, and when they started to hear her moan whenever they came they knew she was addicted and broken in. (Cherry-Gig)
I was touching myself in a hallway i thought was clear, moaning very softly. A licker jumped me, having heard my moans with it's hearing. But it seems that the sound of moans puts them in a mating state (Resident evil)(kingsway)