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A topic that has always interested me, I had various theories about sexuality and its presentations, largely centered around the tendency of partners to prefer a dominant or submissive role in sexual situations. I was speaking with someone about this general concept who claimed to not be affected by this, so I researched it to see what new information is out there. It turns out, there are several factors known to cause aggression and pedophilia as well as hyper-sexuality. Since these seem to be the more common presentations of abnormal sexual preoccupation, it is quite possibly tangential to other, less common paraphilias. This tendency for aggressive behavior involving sex is also present in specific people and seems to be absent from others: http://www.ncbi.nlm.nih.gov/pubmed/9131843 Aggressive sexual behavior can lead to rape in extreme cases and everyone is familiar with pedophilia, an attraction to prepubescent children under the age of 13 that can very often be overwhelming and uncontrollable for the person affected. It is important to study these factors, especially in the manufacture of drugs that could either decrease, or possibly increase one's tendency for aggression, pedophilia and hyper-sexuality among other things you might want to fuck with :V It seems from reading more about this, the main factor preventing these in unaffected people is an inhibitory response generated in the frontal lobe when exposed to sexual depictions involving both of these factors. Lesions in the frontal lobe have been shown to cause just that. Another important contributing factor is problems in the temporal and limbic regions of the brain, where lesions have been shown to cause hyper-sexuality and are often seen in pedophiles in combination with frontal lobe problems causing dis-inhibition. For example, Pick's Disease causes damage to the temporal and frontal regions and can lead to these and other socially inappropriate behaviors. Hypersexuality has also been linked to various disorders, such as manic and bipolar disorders as well as borderline personality syndrome, schizoaffective disorder and social disorders like antisocial personality disorder. From a neuropharmacological perspective, the differences seen in these individuals are similar to those seen in schizophrenics, where dopamine antagonists are used in the case of traditional antipsychotics. SSRI's used for depression are also notorious for causing problems in sexual function, especially with libido. It seems a large factor is antisocial personality: Antisocial tendencies are correlated with social disorders like Autistic Spectrum disorder, however they likely have a distinct cause: http://healthland.time.com/2012/04/10/seeking-the-roots-of-autism-and-antisocial-personality-in-the-brain/ Indeed, sexuality is confusing. The apparent exclusivity of aggressive sexual tendencies to certain people would seem contradictory to the evolutionary ideal for the male, and history has shown the quintessential version idealized in man, in writings and culture. The dichotomy here is probably due to the inhibition described, where a strong male capable of protecting the wife and offspring could be seen as desirable yet the actual act of aggression could serve as a deterrent during sex for those not affected. This also means there is an inherent desire related to pedophilia that has a similar inhibition regarding sex, probably from the protective nature adults have toward children which could be thought of as the idealization of certain traits common among them. Furries are notorious for displaying socially inappropriate behavior in sexual situations as well as just in general. Most of you should be able to relate to this stuff :V EDIT: Also, as a point of interest, people with repressed sexual desires often relate shame and humiliation with sex. Not only does this explain some fetishes, but it also means they can be learned, at least to some extent by Pavlovian Conditioning.