Sankaku Channel/butt crack

Cleavage of the ass, also known as posterior cleavage.

The space between the buttocks or ass.

A well known place for one to put there penis for a buttjob.

Example:
http://cs.sankakucomplex.com/data/51/aa/51aa4cb9107ee0146c43528a08000931.gif

This tag has been aliased to posterior_cleavage.