wow.
in my opinion, sexuality does indeed exist. sexuality in terms of sexual preference is irrelevant. sexuality as in drive/libido does indeed exist (the capacity we have for sexual experiences).
there are many many many arguments in all areas of science about this topic. i think the most important thing to be noted about sexuality in terms of sexual preference is that any behavior (in humans at least) is not proven to be linked to genetics (at least in preference over one gender). in my opinion, i believe sexual preference is psycholocial (mostly social) however to be mentioned; oedipus complexes, reversed oedipal complexes, and westermarck effects. among other things for sexuality; social accpetance, religious beliefs, traumatic responses.
i think that puberty has little effect on sexual preference, it is just the driving force behind acting upon behaviors which they have learned to be socially acceptable. maybe not even "learned" as much as what behaviors they believe would make them more socially accepted. i think more and more with every generation we are leaning more towards gender neutral in terms of sexual attraction. and in my opinion, more animalistic behavior. like someone stated about thinking that any gender is attractive, i believe the thoughts that race through our mind are becoming less conflicted by social acceptance (as homosexuality is becoming more and more socially accepted). therefore, the probability that one would think about having sex with this attraction is higher.
also, getting attention, in any sort of form, makes you more socially accepted. wether it is by the socially acceptable group to the majority or a minority, sometimes this is also a driving factor to sexual preference. also the ever so popular conversation amongst homosexual partners, my partner knows what to do to me sexually because they know what they like and they do it to me. i know the OP didn't really mean sexuality in terms of a capacity for sexual encounters, however with the decreasing oppression of homosexuals/bisexuals, i believe the more sexuality one has (now a days) the more apt they are to have a bisexual/homosexual encounter and find that they like it. lets face it, its sex. sex is great.
and to talk about sexuality as a sexual preference, but not in the topic of sex, but other attractions like loving your partner, i believe that all humans can love another. in my personal opinion, i have a hard time finding love with the opposite sex in the way i would with my wife ONLY because she is the mother to my children. other than that, i would be able to find the same love that i have for my wife in a man. and most definately i wouldnt reject the opportunity with a sexual encounter with a man, if the opportunity presented itself in the right way. i mean, a man knows what i like without having to tell them/show them?
i admit i am not seeking to find a relationship with a man, but only because i already have a deep relationship with my wife. however, if i wasnt in this relationship, im not sure if i would seek a man or not. i guess i'm a little far from my sexual prime and i dont typically think sexually when i see an attractive man, or woman for that matter. of course, if a woman is naked or presenting herself in a sexual fashion, i naturally think sexually. but a man, i tend to compare. i guess its just my nature. and at this time in my life, i really dont care about the social factor. im not in highschool anymore lol.
edit: to touch on what dene stated:
to be attracted to a male with feminine characteristics could be an underlying dominance complex. imagine a male who was bullied as a child? the need to feel dominating over another male as an act of retaliation? i agree with your comment about role confusion, however i dont think that would be the case in a dominance complex in which the role must be absolute, to dominate over the male. but, i think kirjava's relationships with males go much deeper than sexual, dont be so naive. and not to say that kirjava has a dominance complex, as i do not know him at all, but it could be a more probable explanation than penis tastes good.
also, to say that a con is no breasts/vagina, only if he desired a female but in fact chose a male for a sexual partner would this be true. like i state in my post, when talking with homosexual partners about sex, the single most stated thing is how good it feels because they know what i like because they are the same gender as me. also, for males there is a pitcher/catcher, so some males find pleasure not having to be the one doing the work, or being the one to bring pleasure. just let that steep a little bit and you might be able to understand that one. i dont want to go much further with that one.
also, there is also the oedipus complex, however in gender identity crisis. maybe he seeks males sexually, but emotionally wants to be with one like his mother? there are just so many factors that are not sexual. and if you meant that it was a con that he seeks a feminine male that has no breasts/vagina? maybe its just what is sexually unattractive?