and then your star fish falls out
http://en.wikipedia.org/wiki/Rectal_prolapse
First of all that is not brown town gape.
Second of all to be the first person to answer:
It happens when the "Gapee" (heh) is relaxed and spread enough to gape, it helps sometimes to push a little like you are going to take a stuff.
(Of course you won't take a stuff if you understand how to prep for brown town love rather then being a stupid idiot.
Also acting like how all of you guys are acting is what OP wants.