Only real times I can recall anything out of the ordinary was 2 times
once when I was 19 I shared a house with a work mate who was a randy bastard, anyway I get hime one night from doing a night shift and got home about 3am.
Walk in and there he is shagging one of the receptionists over the kitchen table both naked, I just nodded a hello got a beer from the fridge and went up to bed, while they carried on.
Met her a few years later as she emigrated to Oz and came back for a visit, the story came up and she asked why I never asked to join in.
Other time I was stripped naked by 3 waitresses after a night on the piss, and got a hand job or two.
That's about as exciting as it got when it comes to workplace shenanighans