The point where something is switched on in the brain to make the average male, who wouldn't normally consider committing rape, actually think of it as a viable course of action. Usually Alcohol related.
When twomale parties consciously decide to switch female companions at a finite point in the evening.
Jonathon was macking on Susan Friday night. However around midnight there appeared to be a Cincinnati switch as his friend Esteban moved in for Susan, and Jonathon decided to game on Susan's friend Mary whom Esteban was previously chatting with.