Fear the Turtle 

When a woman realizes halfway through vaginal sex that her bowels are full and her enjoyment of the sex has been vastly reduced by her fear of crapping the bed.

“I had to ask Jeff to stop screwing me because I fear the turtle. I got on the can for a minute, then hopped back in bed to finish."

Fear the Turtle by Ren, the Ambivalent One February 23, 2009

Fear the Turtle 

Fear the Turtle is what a woman experiences when she realizes halfway through vaginal intercourse that her bowels are full and her enjoyment of the sex has been superseded by her fear of crapping the bed.

Dan Savage. "Savage Love by Dan Savage – Columns – Savage Love –" The Stranger. Retrieved March 19, 2011.

"Sue had to ask Drew to stop fucking her because she feared the turtle. She got on the can for a minute, then hopped back in bed, and no longer feared the turtle."

Fear the turtle

Fear the Turtle by Skandranon314 January 6, 2012