The perception of what is sexually perverted shifts dependent on who is talking about it. Even the term ‘perversion’ is controversial. Psychologists generally refer to non-traditional sexual behaviour as sexual deviation or, in cases where the specific object of arousal is unusual, as paraphilia. There are a number of clinically recognised disorders of sexual or paraphiliac function: fetishism and transvestic fetishism, exhibitionism, voyeurism, chronophilias, frotteurism, sadomasochism, and ‘others not otherwise specified’ (including scatologia, necrophilia, partialism, zoophilia, coprophilia, klismaphilia and urophilia). However, interesting absences from this list are erotophonophilia, in which sexual arousal can only be achieve...