A man and his son are fishing

the son looks down into the water and sees two fish fighting. he asks his dad what theyre doing and dad says
"son, that theres sex".
"whats sex?" replies the son.
"Well, let's just finish fishing and I'll take ya home and show ya."
They finish fishing and drive home and on the way home the dad calls his wife and says "honey, I'mma need you to go into the bedroom, strip down, and lay spread eagle on the bed"
"Well, Alright" she responds
The father and son get home and the dad takes his son into their room. Sits him down in front of his nude mother and says "alright son, you see that hole right there in momma?"
"Yea"
"Watch this"
He begins the act with the son watching and this goes for quite some time. After a while the little sister walks in and goes "bubba what's daddy doing to mommy?"
He responds "you see that hole right there in daddy? Watch this"