When performing the act of sex while in the doggy style position and entering vaginally, use your index finger to slide in and out of her brown eye. If you realize your finger is becoming engulfed in matter of a brown nature, swing your finger up to her mouth and hook her like a fish.
Billy: I was tapping Tammy from behind and doing that thing she loves with my finger in her ass, but then I realized my finger was covered in shit.
Jim: That's fucked up. What did you do?
Billy The Rusty Fishhook.
Jim: God damn right.