i was around 7 when we went to my buddy alex davis' house. well, alex's mom was laying on the couch with her boyfriend on top of her, fully clothed... but there pants were connected in a wierd way, like buttoned together... we knew what was up.
My sis and I figure that M&D only had sex twice, we never had to deal with the painfull walk-in. As for them, they have walked in on me several times, they never would say anything only turn around and leave.