text: what would you do if your child would catch you in the middle of having sex? tell me what would you do the morning after? depends how old the child is.  this happened to me when i was about fourteen.  there was no need to explain to me what they were doing, as i already knew.  if the child was younger, i would sit down with both parents. (this just reassures them) and explain to him that mom and dad need some time alone.  if you feel comfortable, it would be a good time to "have the talk" with them.  if not, just continue to explain as best you can....or like spiderman suggests, just avoid them.