I would walk away and let them have some privacy.
Reach for my smartphone...
Leave them alone,what would one do if some animals are having s e x.Let self nature be and a lot of sexual perversion will vanish.
Shout "Mum! Dad! I'm trying to read here ... god I hate being a member of the Waltons"
Probably blush and think, "yup, didn't need to see that..where are the MIB when you need them?"
Smile and wave...smile and wave.
Depends on location if you open bedroom door then close it quietly but if in public move back and watch i know for me turn on if some one watching called that's called exhibitionist and you can't be one if no one watches
Probably let them have some privacy. That's what the horrified family who parked next to my college girlfriend and me did! I've never lost an erection so fast in my life!
I'd likely just quietly watch and play with my ****.
Watch - malways interested in learning new technique
Slow clap. And then probably put one hand in my pants.
If they are in public, they want to be seen. So I'd watch, and ask to join.
I would watch from a respectful distance. This happened to me one time years ago when my g/f and I were "doing it" on what we thought was a deserted trail in a park. Another couple came by and, unfortunately, we hadn't planned for that as we were more or less blocking the trail. They were real cool; they somewhat embarassingly excused themselves and then proceeded to walk around us as best they could, but they had to come a lot closer than anybody was comfortable with at the time. Afterwards we had a real good laugh, and have retold the story many times; it never fails to amuse all concerned.
Hit them with a frozen dinner and tell them the frozen food aisle in krogers is no place for that.
probably try to look away....not saying I would be able to...guess it would also depend on whether they looked like they wanted privacy or were hoping someone to spot them!