Autosodomy
From wipipedia.org
Autosodomy is the act of a man inserting his penis into his own anus. This can only be performed by a man with a penis long enough, and by moving the genitals to one side.
It is not clear whether this is possible, although among the billions of men on Earth, there may be someone who can do it.
Autosodomy is sometimes mis-named as 'Autopederasty', which is an impossible term.
