Surprises me the amount of people who if they knew the kids, wouldn't even mention seeing them screwing in the grass next to their house! If it was my house and they were kids I knew, I'd say something to them same as I'd say something to anyone. Why so nervous folkies? If they're out there screwing in a public place they have to be aware there will be neighbours around, though they might not give a crap of course - wouldn't be the first time kids thought they owned the world.