Sexual perversion include all -

Ref:Textbook of forensic medicine and toxicology (V.V.Pillay)17th edition, page no. 414 The term sadism, a sexual perversion, is applied to sexual arousal and orgasm linked to the active infliction, in fantacy or reality, subjugation, or toure of sexual paner. Incest is defined as natural sexual intercourse between two persons so closely related that they are forbidden by law to marry. Bestiality is the unnatural sexual intercourse with a lower animal. Buccal coitus: Intercourse b/w penis of a man & oral cavity of another man, a woman or a child. It is also known as coitus per os/sin of Gomorrah.