Sexercise

Jane is a marathon runner. She competed in a recent city marathon but unfortunately failed to finish because she kept getting dragged into all the public toilets along the route having anal sex. She only realized why when she finally
got home and took the number off her back as a cruel joke by her best friend who had written
"Please Fuck My Ass" in place of the number.
As a result, Jane found she preferred getting her excersice on her back.