I don't have much time to discuss this topic, but it reminded me of a radio program that I once listened to where the psychologist introduced the topic of "love maps" and explained how they are formed early and can sometimes be very narrow and specific. Sometimes objects, instead of people get into one's "love map" (my memory is not too good). It is something that one can study that I think could lead to getting at the the kind of information and studies that relate to this topic.
I think this even more when I just checked what someone has put in wikipedia:
[quote author=wikipedia]
A lovemap is a concept originated by John Money to assist a discussion of why people like what they enjoy sexually and erotically. According to Money, it is "a developmental representation or template in the mind and in the brain depicting the idealized lover and the idealized program of sexual and erotic activity projected in imagery or actually engaged in with that lover.
SNIP
Money describes the formation of an individual's lovemap as similar to the acquirement of a native language, in that it bears the mark of his or her own unique individuality, similar to an accent in a spoken language. A lovemap is usually quite specific as to details of the physiognomy, build, race, and color of the ideal lover, not to mention temperament, manner, etc.[citation needed] Since its inception, the concept of “love maps”, applied to interpersonal relationships, has found apt acceptance[citation needed] and is frequently referenced in love / relationship / sexual-evolution theory books;[citation needed] as for example in Wilson and McLaughlin’s 2001 The Science of Love.[2]
In "Gay, Straight, and In-Between: The Sexology of Erotic Orientation," Money (1988: 127-128) suggests that love is like a Rorschach (ink blot) test, where if projections (shaped by a body/mind's lovemap) on the other are mutual, pair-bonding occurs, typically in a courtship phase of mating.
* Heterosexual lovemaps – love mappings associative to persons of the opposite gender.
* Homosexual lovemaps – love mappings associative to persons of the same gender.
* Vandalized lovemaps – is when the love mapping process or neurological template development stage becomes traumatized, as when a young child is either exposed to, or forced to participate in such inappropriate behaviors as pedophilia, incest, or sexual sado-masochism. Such a lovemap is typically formed between the ages of two to eight. A vandalized lovemap is often an atypical lovemap.
* Paraphilic lovemaps – when lust is attached to fantasies and practices that are socially forbidden, disapproved, ridiculed, or penalized; sometimes as the result of residual imprinted memories from certain traumatic or unusual episodes from early childhood, or sometimes the result of various physiological anomalies such as the presence of a micropenis, a chromosomal abnormality (45, X/46, XY), or of accelerated growth (premature puberty).
* Native lovemap - by analogy with native language, is a lovemap that is assimilated as one's own personal, inalienable possession, regardless of how many of its attributes are shared, or not shared by others.
* Klismaphilic lovemap – specifies both in fantasy and performance that the person’s sexual and erotic will be aroused, and orgasm achieved, only if the partner participates in a scenario of administering an enema.
* Acrotomophilic lovemap – specifies a paraphilia of the stigmatic/eligibilic type in which sexual and erotic arousal and facilitation of attainment of orgasm are responsive to, and dependent upon a partner who is an amputee, or in extreme cases a thalidomide baby who has reached adulthood.
* Zoophilic lovemap – specifies a paraphilia of the stigmatic/eligibilic type in which sexual and erotic arousal and facilitation of attainment of orgasm are responsive to, and dependent upon engaging in cross-species sexual activities, that is, with an animal.
[/quote]
Hopefully this might be a useful hint!