Similar to an ear stretcher but is placed in the rear end. Can range from a 3mm diamater to 25mm. Varies in colours and for best results leave in when walking around despite looking like you have laid a log in your pants.
Jj: hey Bill, can i borrow your 12mm anal stretcher my 6mm is to loose and my ass ate it.
Bill: sure thing mate mine has a pull string so won't get lost
Yost: hey guys, my 25mm piece is too tight, know where i can get a 20mm anal stretcher from ?