So, there was that erotic thing, which I was pretty ashamed of at the time, and _of course_ knew that I must never, ever tell a single soul about. (It would have been about three years since the fantasy started that I even worked up the bravery to [tell my Diary about it](/ancillary/diary/53/#first-agp-confession).)
-But within a couple years, I also developed this beautiful pure sacred self-identity thing that would persist indefinitely, where I started having a lot of _non_-sexual thoughts about being female. Just—little day-to-day thoughts, little symbolic gestures.
+<a id="beautiful-pure-sacred-self-identity"></a>But within a couple years, I also developed this beautiful pure sacred self-identity thing that would persist indefinitely, where I started having a lot of _non_-sexual thoughts about being female. Just—little day-to-day thoughts, little symbolic gestures.
Like when I would [write in my pocket notebook in the persona of my female analogue](/images/crossdreaming_notebook_samples.png).
It would be hard to overstate how much of an impact this post had on me. I've previously linked it on [this](/2016/Nov/reply-to-ozy-on-two-type-mtf-taxonomy/#changing-emotions-link) [blog](/2017/Jan/the-line-in-the-sand-or-my-slippery-slope-anchoring-action-plan/#changing-emotions-link) [five](/2018/Apr/reply-to-the-unit-of-caring-on-adult-human-females/#changing-emotions-link) [different](/2018/Dec/untitled-metablogging-26-december-2018/#changing-emotions-link) [times](/2019/Aug/the-social-construction-of-reality-and-the-sheer-goddamned-pointlessness-of-reason/#changing-emotions-link). In June 2008, half a year before it was published, I encountered the [2004 Extropians mailing list post](https://archive.is/En6qW) that the blog post had clearly been revised from. (The fact that I was trawling through old mailing list archives searching for Yudkowsky content that I hadn't already read, tells you something about what a fanboy I am—if, um, you hadn't already noticed.) I immediately wrote to a friend: "[...] I cannot adequately talk about my feelings. Am I shocked, liberated, relieved, scared, angry, amused?"
-The argument goes: it might be easy to _imagine_ changing sex and refer to the idea in a short English sentence, but the real physical world has implementation details, and the implementation details aren't filled in by the short English sentence. The human body, including the brain, is an enormously complex integrated organism; there's no [plug-and-play](https://en.wikipedia.org/wiki/Plug_and_play) architecture by which you can just swap your brain into a new body and have everything Just Work without re-mapping the connections in your motor cortex. And even that's not _really_ a sex change, as far as the whole integrated system is concerned—
+<a id="changing-sex-is-hard"></a>The argument goes: it might be easy to _imagine_ changing sex and refer to the idea in a short English sentence, but the real physical world has implementation details, and the implementation details aren't filled in by the short English sentence. The human body, including the brain, is an enormously complex integrated organism; there's no [plug-and-play](https://en.wikipedia.org/wiki/Plug_and_play) architecture by which you can just swap your brain into a new body and have everything Just Work without re-mapping the connections in your motor cortex. And even that's not _really_ a sex change, as far as the whole integrated system is concerned—
> Remapping the connections from the remapped somatic areas to the pleasure center will ... give you a vagina-shaped penis, more or less. That doesn't make you a woman. You'd still be attracted to girls, and no, that would not make you a lesbian; it would make you a normal, masculine man wearing a female body like a suit of clothing.
>
A single-variable measurement like height is like a single coin: unless the coin is _very_ biased, one flip can't tell you much about the bias. But there are lots of things about people for which it's not that they can't be measured, but that the measurements require _more than one number_—which correspondingly offer more information about the distribution generating them.
-And knowledge about the distribution is genuinely informative. Occasionally you hear progressive-minded people dismiss and disdain simpleminded transphobes who believe that chromosomes determine sex, when actually, most people haven't been karyotyped and don't _know_ what chromosomes they have. (Um, with respect to some sense of the word "know" that doesn't care how unsurprised I was that my [23andMe](http://23andme.com/) results came back with a _Y_ and that I would have happily bet on this at extremely generous odds.)
+<a id="chromosomes"></a>And knowledge about the distribution is genuinely informative. Occasionally you hear progressive-minded people dismiss and disdain simpleminded transphobes who believe that chromosomes determine sex, when actually, most people haven't been karyotyped and don't _know_ what chromosomes they have. (Um, with respect to some sense of the word "know" that doesn't care how unsurprised I was that my [23andMe](http://23andme.com/) results came back with a _Y_ and that I would have happily bet on this at extremely generous odds.)
Certainly, I agree that almost no one interacts with sex chromosomes on a day-to-day basis; no one even knew that sex chromosomes _existed_ before 1905. [(Co-discovered by a woman!)](https://en.wikipedia.org/wiki/Nettie_Stevens) But the function of [intensional definitions](https://www.lesswrong.com/posts/HsznWM9A7NiuGsp28/extensions-and-intensions) in human natural language isn't to exhaustively [pinpoint](https://www.lesswrong.com/posts/3FoMuCLqZggTxoC3S/logical-pinpointing) a concept in the detail it would be implemented in an AI's executing code, but rather to provide a "treasure map" sufficient for a listener to pick out the corresponding concept in their own world-model: that's why [Diogenes exhibiting a plucked chicken in response to Plato's definition of a human as a "featherless biped"](https://www.lesswrong.com/posts/jMTbQj9XB5ah2maup/similarity-clusters) seems like a cheap "gotcha"—we all instantly know that's not what Plato meant. ["The challenge is figuring out which things are similar to each other—which things are clustered together—and sometimes, which things have a common cause."](https://www.lesswrong.com/posts/d5NyJ2Lf6N22AD9PB/where-to-draw-the-boundary) But sex chromosomes, and to a large extent specifically the [SRY gene](https://en.wikipedia.org/wiki/Testis-determining_factor) located on the Y chromosome, _are_ such a common cause—the root of the [causal graph](https://www.lesswrong.com/posts/hzuSDMx7pd2uxFc5w/causal-diagrams-and-causal-models) underlying all _other_ sex differences. A smart natural philosopher living _before_ 1905, knowing about all the various observed differences between women and men, might have guessed at the existence of some molecular mechanism of sex determination, and been _right_. By the "treasure map" standard, "XX is female; XY is male" is a pretty _well-performing_ definition—if you're looking for a [_simple_ membership test](https://www.lesswrong.com/posts/edEXi4SpkXfvaX42j/schelling-categories-and-simple-membership-tests) that's entangled with a lot of information about the many intricate ways in which females and males statistically differ.
Okay. Having supplied just enough language to _start_ to talk about what it would even mean to actually become female—is that what I _want_?
-I've just explained that, _in principle_, it could be done, so you might think there's no _conceptual_ problem with the idea of changing sex, in the same sense that there's nothing _conceptually_ wrong with Jules Verne's [pair](https://en.wikipedia.org/wiki/From_the_Earth_to_the_Moon) of [novels](https://en.wikipedia.org/wiki/Around_the_Moon) about flying around the moon. There are lots of technical rocket-science details that Verne didn't and couldn't have known about in the 1860s, but the _basic idea_ was sound, and [actually achieved a hundred years later](https://en.wikipedia.org/wiki/Apollo_8). So why is it in any way is it _relevant_ that making the magical transformation fantasy real would be technically complicated?
+I've just explained that, _in principle_, it could be done, so you might think there's no _conceptual_ problem with the idea of changing sex, in the same sense that there's nothing _conceptually_ wrong with Jules Verne's [pair](https://en.wikipedia.org/wiki/From_the_Earth_to_the_Moon) of [novels](https://en.wikipedia.org/wiki/Around_the_Moon) about flying around the moon. There are lots of technical rocket-science details that Verne didn't and couldn't have known about in the 1860s, but the _basic idea_ was sound, and [actually achieved a hundred years later](https://en.wikipedia.org/wiki/Apollo_8). So why is it in any way _relevant_ that making the magical transformation fantasy real would be technically complicated?
It's relevant insofar as the technical details change your evaluation of the desirability of _what_ is to be accomplished, which can differ from [what sounds like good news in the moment of first hearing about the idea](https://www.lesswrong.com/posts/pK4HTxuv6mftHXWC3/prolegomena-to-a-theory-of-fun).
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