Had a long running affair(6 months) if that is long with a co-worker. We would met in the mornings at work and have sex. Before opening. Once she game me a BJ during businees hours in the basement while I was counting inventory.
I do not advise this as I have since started to regret ever doing it.
I also have had sex at my wife's place of employment, twice. Great time it was.
Would do that again if i could talk her into it.