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True, and I do believe it exists. But I have lurked at AVEN.....how do asexuals know that they simply haven't met the right person to turn them on? Before I get attacked, let me explain. I am not attracted to girls in general. I am attracted to people who happen to be girls. Make sense? It does seem like asexuals think that sexual people are always horny all the time. That's not true. Maybe asexual people are just really really picky. So it does exist.
This is a whole lot of fail all in two posts.
Saying "
how do asexuals know that they simply haven't met the right person to turn them on" is like saying "how do gay people know that they're gay, maybe they just haven't met the right heterosexual person to make them normal?"
Absolutely, sexuality is fluid. Some people who identify as asexual some time might identify as demisexual or sexual later, but that doesn't invalidate their experience. Much like a lesbian dating a man doesn't mean she "wasn't a lesbian".
Likewise, saying "
How do you know if asexuality is a preference, as oppose to someone who may have an underlying medical or psychological issue that may be treated and help increase sexual desire?" is much like saying "how do you know if homosexuality is a preference, and not just a medical or psychological issue that may be treated and help normalize the person and increase heterosexual feelings/expression?" - aka, a really offensive and silly thing to say.
"
It does seem like asexuals think that sexual people are always horny all the time." <-- blatant and inappropriate use of stereotype. Would you appreciate it if I said that "it seems like all of you gay people think straight people are always horny all the time, and you're wrong"? Probably not.
"
A sexual response is based on how much you really really like a person." ... uhm, just, no. Some sexuals entire sex life consists of one night stands with people they don't care about much less like. Some asexuals are lovingly married. Attraction, fondness, or affection have scarce little to do with how engorged your genitalia becomes at the sight of a person.
"
Maybe asexual people are just really really picky." Again, would you appreciate it if someone said "maybe lesbian girls are just really picky and if the right man came along they wouldn't be (this perceived inferior state of) a lesbian after all?"
"
Although if I recall correctly, asexuality is connected to high functioning autism. " No again, and, again. Would you like it if people said "lesbianism is connected to x disability, because I know a lot of disabled lesbians, so it must be their disability making them lesbian"? No, because that would be ridiculous. Asexuality is more visible in autistic culture, which is why more autistic people are out as ace. This in no way reflects the actual rate of the orientation compared to non-autistics: they're just less likely to know about it.
To sum it up: human sexuality is ridiculously, ridiculously complicated. There are many, many many many possible valid expressions, and you're pretty much bound to say something stupid or offensive if you pick an orientation/expression/behavior (which is consensual) and say the words "are you sure that person doesn't have a disorder which needs therapy".
Just because it isn't your cup of tea, doesn't mean its basically ever acceptable to call consensual sexual expression (or indeed nonexpression) "maybe disordered" or to imply that it might be changed if that person could just "meet the right normal person". Never.