I had the misfortune of walking in on my mom and her new husband “doing it” when I was three. The memory for me is still clear as day. Mom on the bed, lying on her back with her knees bent and spread. She’s naked save the towel she has wrapped around her head and she is shrieking with laughter. My new “dad” is standing at the other end of the room and takes a running leap towards the bed, balls and junk swinging all around, and JUMPS on my mom. The memory ends there. I have no idea what happened next.