Jacking off to your sister

Fuckin' Right

 

Yep! When I was a kid on the farm I saw this young bull get a long red hardon and mount a cow - His MOTHER!

Well, at the time it was kinda upsetting, being totally entrenched in our cultural taboos. But consider the ancient Egyptians did incest all the time. Pharoahs married their sister all the time.

As for me, I have a sister and never thought anything sexual toward her. I did once did dream that I was fucking her (as a teen before I even knew how to fuck) and it creeped me out when I woke up.