Oh man i have not argued on the internet for so long. What political disagreement i have tend to be in person discussions with my wife's circle of friends where my wife is forever worried they will think i'm a Nazi. A rather different set of circumstances than 2007.
But for old times sake..
@89th said in Dewey wrote a book!:
I guess we should start with a base. I'd assert that it is the fundamental wiring of human sexuality to be attracted to the opposite sex for the purpose of procreating. It's why we have a penis and women have a vagina. It's why our hormones increase earlier in life, to begin the procreation process, and why the urges decrease over time as the need to procreate diminishes. Forget the meaning of "normal" but in the pragmatic sense, it is the norm for humans to be attracted to the opposite sex.
If you disagree with this, then ok... probably aren't going to do anything but argue in circles.
But if you agree with this, then to answer your question it's an impairment or whatever as an attraction to the opposite sex is on the spectrum of sexual attraction deviation. By default does this make it wrong? No. Religiously, sure... Culturally, some say yes, some say no... depends where values are at the moment, something that is always changing. Laws are just codified morality, after all. So if there is a sexual impairment or disorder, it is similar to other mental (or physical) malformations... biological diversity, to @Doctor-Phibes 's point, which I can see.
So i think you perceive structure and function in the anatomical and behavioural differences between the sexes - one that has a clear evolutionary origin. Consequently you classify deviations from this structure/function as impairment/disorder/etc.
So from a secular perspective the problem is that this attaches ethical significant to blind forces of evolutionary biology. Just because we are fashioned by natural selection does not automatically mean that in everyday speech we should classify humans using an evolutionary perspective. This is particularly true when the words have some normative significance to them. Evolution by natural selection is a blind force, it's crucial for understanding how things are but totally inconsequential when deciding whether some aspect of human behaviour is good or bad. As there is no intention to evolution by natural selection there is no "fundamental" wiring, there is only wiring. There is no intrinsic order, there is just whatever emerges. To talk about homosexuality being an impairment is a bit like talking about a moon that rotates in the opposite direction to the planet that it orbits as an 'impaired' moon because the usual explanation for how planetary bodies form means they all rotate in the same direction. We don't speak like this because we aren't seduced into the idea that there is some intention that all planetary bodies are 'supposed' to rotate the same way, while the fact natural selection can look like design means people are seduced into talking as if it is design and that the designer has a specific purpose.
So to recap - from a secular perspective it doesn't really make sense to talk about some putative fundamental order that is being violated by X human behaviour.
Secondly if you were to be consistent you would have to call alot of behaviours that will seem normal or even desireable to be impairments or disorders. Use of birth control is the mother of all behavioural disorders (as an aside it is an amazing fact, and one that AI doomers are quick to point out, that evolution by natural seelction has continuously selected genes for their reproductive fitness for the best part of 4 billion years. Yet just doing that, just picking the best replicator again and again and again, ultimately built a machine that subverts it's own replication). Now you may be happy with that but how about acts of altruism - if you put yourself at risk to safe the life of a stranger, you are engaging in a behaviour that is very clearly opposed to the evolutionary forces that shaped you - should we call it a behavioural disorder?
Given the above two points and since people who are gay are totally fine living their lives provided they are treated like everyone else and crucially, absent religious indoctrination, do not view themselves as defective in any way. I don't think there can be any justification in defining them as such. Particularly given that such language is intrinsically judgemental and almost always carries stigma.