What? I was the fornicator...
We heard the door click open right at the critical moment and my partner pushed it shut....(Thankfully he was tall, so had long arms!)
"then there was this what are you doing in there??"
Then I think they figured it out and left....and we finished off...not that we stopped the action really.
We went down several floors...no one was any the wiser as to who we were then!