``Habitual passive sodomite takes knee-chest position without shame during examination." —From Principles of Forensic Medicine by staff members of the Forensic & Clinical Toxicology Department. Ain Shams University Faculty of Medicine.

Forensic examinations to prove habitual non-violent anal penetration are inherited from the textbooks of Victorian era medicine[1].

There are no peer-reviewed research that provides sound evidence in that area[2]. Because sodomy was decriminalized in western Europe by the beginning of the 20th century[1]. While countries that still considers such acts criminal are not publishers of sound peer-reviewed research.  read more »