I worked somewhere where a female co-worker hired a "stripper-gram" or something for another male co-worker's birthday in the office. I was single and not even dating at the time, but felt extremely uncomfortable with an actual stripper in the office, myself. So, even though they seemed to be consenting, I didn't appreciate having a stripper in the office, and neither did several of my (also male) coworkers.

I can imagine any amount of ogling would be uncomfortable, regardless of consent of the participants, to an observer.