My girlfriend and I were going at it, at the work xmas party last year (in the disabled toilet at the venue). We were in there for at least 30min, she was moaning really loud and yelling "fuck me, fuck me u horny devil".
We came out later separately and about 10 workmates stared at me on my way out, apparently they heard :-)
I wasn’t surprised, or bothered since we both left our jobs in the New Year.