Pick a random booth

You walk to a booth, about in the middle of the row and close the door behind you. You don't see any way to trigger the occupied light, so you assume that is works by motion sensor or something.

On the side walls of the booth, there is one hole on each. Both conveniently at waist level. On the back wall there's a small TV screen playing just some porn. Next to it there are instructions on how to change to a different video. You pick a one with 'gloryhole' theme, since it feels the most fitting. There is also a small padded stool in the booth. You reckon that it might come handy.