In 2011, Anil Aggrawal proposed ten-point classification system of zoophilia, based on forensic literature review.

(1) Allow for conceptualization and improved management of zoophilic patients in clinical practice or forensic examinations, (2) describe identity of modern-day zoophiles, including demographics and psycho-social profile, and (3) determine normative and pathologic traits and behaviours.

A qualitative observational study of user activity (n=958) on discussion forums, combined with brief demographic survey. Data were analyzed according to principles of grounded theory. Surveys of own design (demographic, discreet+open ended questions) were answered by 350 participants. Presented data show aggregate conclusions from mixed methods qualitative and quantitative analysis.

Proposed classification system categorizes zoos as either classic, sexual, romantic, or platonic. Relationship goals of classic and romantic zoos are reminiscent of those typical of human partnership, differentiated by the commitment and psychological distress level (romantic zoos, affectionate relationship goals outweigh sexual pursuit; classic zoos, romantic and sexual urges cause distress rather than pleasure). Sexual zoos show high prevalence of hypersexuality traits. Platonic zoos are typically confused about the roots of their sexuality. Contrary to common perceptions, prevalence of sexual sadism is extremely low (<1% in our study). Sociopathic traits determine propensity for animal cruelty, which is not synonymous with typical zoophilia. Half of respondents were in committed relationship with human partner, whom they frequently attempted to “convert” into practicing zoophile.

We can categorize zoophiles into four sub-types. Emotional attachment and sexual urges play equal role in bonding with animal partner.