Undercover cops of any kind are phobic about being recognized, and don't ever want you to get a good look at them.
Some stations are suited for a good time—well kept, sanitary, and run smoothly, with scheduled appointments and all, like the one Jonah found.
The recently renewed interest in glory holes seems to be widespread, at least according to people who run private stations.
The point is watch what you post in open forums like that.
Click on the map markers to get detailed information about each Glory Hole.
You are actually looking for a disguise, or someone that will not meet your gaze.