To lay out toilet paper or tissues in the toilet for your shit to land on when it comes out of your ass. This usually minimizes swirl marks in the bowl upon flushing.
With respect to human sexuality and arousal, a point is often reached that limits both the willingness and accessibility to advance into more adventurous, often uncharted territory; the surprise digital detection of a rectal 'occupant' serves as a cautious reminder to proceed with caution unless alternative preparations can be arranged.
She was so hot and seemed to want more, so I slipped my finger in and, damn, a turd snout ruined everything...amateur!