I found this article over on MyDeathSpace.com.
Most of us have walked in on our parents…or at least heard our parents having sex. What makes this case different is they let her watch, and they did it “all the time”.
They claim it was to educate her about sex, but couldn’t you just show her some pictures? My parents had a little book for kids. Plus she was already 9! I’m sure she’s well aware of how sex works. And why did they feel the need to “educate” her more than once?
To me, it sounds more like they got off on having the daughter watch or some sort of twisted revenge on her father than it was actual “education”.