NC for this as I'm mortified.
Would never normally happen. We don't do it often and when we do we are discreet! But last night dp and I had a few drinks and had some rather loud and ahem, vigorous adult time 
Walls are thin, semi detached house and about half way through we heard a very loud intentional cough from next door. Obviously realised if we could hear them then they could hear us. Stopped quite soon after.
It was late and we were being inconsiderate. I wasn't thinking and I was definitely making a lot of noise
Now I'm totally embarrassed. Obviously I would never bring it up so do I just front it out when I next see them or hide indoors forever??? Please tell me it's no big deal!!!!