Part 1/2
Arachnarok_Rider: The Danish word for gender and sexes is the same, and it can also mean both pretty and ugly, depending on how you use it. That does not really have any underlying meaning, it's just how the language developed. Thus a linguistic oddity. In some other languages, the same word is used for both the biological sexes and the cultural perception of them. In other languages there may be more words. It does not mean a thing in itself. And in English, as you are clearly aware, the words sex and gender superficially appear to mean the same thing, but they do have a difference of nuance, even if one might not agree with it.
I would agree that using the same word for 'male/female' and for 'ugly/pretty' seems a linguistic oddity, though I can see how one could have arrived there :p (Incidentally, which sex corresponds to which degree of aesthetic pleasure?) But I still don't agree that it's odd to use one word for sex and its cultural perception, since they have always been two sides of the same coin. Like you say, whether or not there exist languages with multiple words for different nuances of sex, is not meaningful, or rather, is not sufficient reason to declare that languages which don't share this feature possess a linguistic oddity...
Like I said before, in English the words 'sex' and 'gender' do not have the same meaning, they have nothing to do with each other. I know what you are getting at, but using 'gender' to describe either sex or role interpretation is an abuse of language that I will have no part of. It's like saying 'gay' does not mean something akin to 'colourful/cheerful/flamboyant', or queer does not mean 'odd/weird/strange/bizarre', or that rainbows can now only be used in reference to the alphabet soup-crowd. It's hijacking of pre-existing terminology; if you need a new word, then coin a new word (and I will use my right to not acknowledge its existence), but don't take an existing word and strip it of its meaning.
Arachnarok_Rider: As for gender identity being unreal because it isn't a physically tangible thing, neither is our sentience and a bunch of other fluffy things. Feelings, moods, spiritual stuff... None of that is tangible but you're not going to argue that just because you can't reach out and touch God then He must be false?
While I don't want to imply that nothing intangible can be real, as a scientist I would say that there is actually a good case to be made for arguing against the objective existence of most intangible/fluffy things. I do believe in God, and I do believe in a fraction of the things theologians present as 'evidence' for His existence, but I would be very hesitant to say that it constitutes evidence. I can understand the logic that leads people to say God does not exist, and it's not (always) bad logic -- though it is again something you can also not be certain of. (The quote I gave before from Donovan Loucks, himself a christian, would apply to God too.)
Arachnarok_Rider: But "gender" is artificial, I agree completely. So does the gender studies crowd, as it happens. Gender has no meaning outside of human societies, because all it describes is something intangible observed within human societies. Gender is a social construct, biological sexes are not. Yes, I went there. Sorry, but you did go Lovecraft on me. :-)
If there's anyone you don't need to apologize to for saying that, it would be me ;) But going by the proper use of 'gender', I would of course say you are wrong, because it is a linguistic construct. I agree with Devoras that you seem to be using 'gender' to refer to 'gender roles' (or more correctly 'sex roles'), though (s)he is also wrong in saying 'sex'='gender'.
Anyway, I agree that 'sex roles' (that is the collection of stereotypes and characterizations attributed to a sex within a given culture) are a social construct. I would go even further than you, and say that they have no meaning outside of the specific culture in which that role interpretation exists. I do not agree, however, that they are limited to human societies: animals also exhibit role interpretation, which can even differ from breed to breed or colony to colony (e.g. which sex hunts, or both? which sex takes care of the young, or both?)
Arachnarok_Rider: You are suggesting that there is no separating the cultural understanding of gender from the biological sex, but that is in itself part of the cultural gender discussion and entirely unrelated to the biological aspect of sexes. So clearly that is something that could do with its own word, in order to not drown in double and triple meanings. A new word could have been found, but they didn't. They repurposed "gender" and that's where we are. It is what it is.
I did not mean to suggest that it is impossible to separate biological sex from 'sex roles'; but that there never used to be a dichotomy between the sex of your physical body and the sex of your mind/spirit/soul. If someone called a man effeminate, they meant that he is fulfilling roles associated with women in that culture. There wasn't any of this modern 'woman trapped inside a man's body' nonsense.
I agree a new word should have been found, and it fact it kind of has, namely 'gender role' (which should be 'sex role'). But I'm not sure what you mean when you say 'it is what it is': if you mean, people will be idiots and insist on abusing words, sadly yes; but if you mean, now that this word is being abused, everyone should conform to its misuse, then no.
Arachnarok_Rider: We can talk about certain traits correlating strongly or less strongly with one or the other sex, and we do, but there are clearly more factors in play than just the sex. And so we arrive at the concept of a gender spectrum rather than a gender binary, specifically meaning that there are a whole lot of different ways to be a man, a whole lot of different ways to be a woman, and a lot of people who mix and match masculine and feminine traits and thus exist somewhere between the two main segments.
Obviously, there are more things than an individual's biological sex that determine their behaviour, but why does that require the introduction of spectrum? Just say, every individual is unique... People even change over time, this has nothing to do with one man being/behaving more like a woman than another man... maybe that guy just like cooking/gardening/childcare more than the other -- no spectrum necessary!
People don't "exist between" masculine and feminine, or man and woman, they are either a man (if they were born with XY chromosomes) or a woman (if they were born with XX chromosomes), or a very few unlucky ones may have a serious genetic defect and be hermaphrodites (if they have XXY chromosomes).
Arachnarok_Rider: At a personal level, whether I'm described as a binary man or as a male sex person who identifies as male and who displays a fair few masculine traits by people I don't know and don't care about? It has as much significance to me as back when they had that whole discussion of whether to demote Pluto to a plutoid or keep it as a planet. It didn't really change Pluto, after all. I think of myself as a guy and of Pluto as a crappy little planet but if other people want to use different terms that mean essentially the same thing then what is it to me?
I agree, at a personal level it doesn't really matter, but insults never really do... (What's gonna happen if you feel insulted? Are you or the other guy magically going to develop cancer? No, so it doesn't matter.)
But it's the implication that matters, the implication that there can be something that is not a man or a woman (and was not born a hermaphrodite), the implication that it is possible to be a woman who identifies as a man, or vice versa.
It matters because you are being taken away the freedom to think for yourself: if I identify as a woman, I must be allowed in the women's bathroom; if he identifies as a toddler, he can't be a pedophile; if she identifies as a cosmologist, then she must be allowed to be nominated for the MIT's Infinite Kilometer Award... See, it doesn't work, yet all these examples have really happened!
I try to live by the very simple rule of thumb, that each individual should be given as much freedom as is possible without encroaching on the freedom of others. If you want to identify as a woman, go ahead, it's your prerogative, but I am at liberty to say you are wrong and nature disagrees with you.
(Incidentally, about Pluto: I agree the whole discussion was really blown up, but the reason why Pluto is a planet and not a 'planetoid' is because the IAU voting was rigged. So, that doesn't mean it can never be demoted, just that it never legally has as of yet ;) )