I'll take a shot at fulfilling BWL's request for 5 reasons why not to start the sphincter thread. here's one--think childbirth. Episiotomy. Tearing episiotomy. All the way back. You got it--you just tore yourself a new asshole (as my ex put it so inelegantly as my OB stitched up the episiotomy "starting with the sphincter"--you can imagine the sinking feeling I experienced).

Okay. That one was relatively short, even if it wasn't too sweet (the baby girl was the sweet part). You think I'm the only one with stories that will make you guys cringe? You just start that thread, BWL, and you'll hear about it! Mark my words!