What is wrong with Political Correctness in some cases?

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Gender studies focus more on cultural gender where sex can be construed in the context of intimacy. It just so happens that intersex, bisexual people all like intimacy too.

It happens that intimacy is much more than reproduction, too.
What I'm trying to say is, reproduction in humans is overwhelmingly binary. Other aspects of life don't have to.

As we're past the times when an average woman had to give 5 births to keep the population stable, we can make our lives not as much about reproduction as it used to be 1000 years ago.

Not true, intersex men (trans male-female) and gay women can have children

Ahem... sex is about ability to make babies. In humans, some can produce sperm and some can get pregnant. Sometimes neither, very rarely both. That's biology. Sexual reproduction.
What you are talking about (guessing weather someone you meet on a street is male or female to use the right pronouns etc.) is gender.

Judgement calls are on language. Always, because language is arbitrary on its grouping together and separating ideas. That's why some cultural differences can be seen in linguistic differences.
There are many aspects of what we consider "male" and "female". Some are binary. Some not.
So, we need subtler language to discuss it on subtler levels.

It is accurate and it is objective.

I don’t deny that subjective definitions of sex can be invented through wishful thinking, but I prefer an outlook that’s less distorted by emotion.

A simple example where this will no longer apply is when a male who chooses to clone a cell from himself which is converted to an embryo and implanted in a womb, The child is 100% the mans.

Your personal views don’t become objective simply because you say they do.

Your ideas about sex are not scientific, and are driven by emotion rather than reason.

"Contrary to popular belief, scientific research helps us better understand the unique and real transgender experience. Specifically, through three subjects: (1) genetics, (2) neurobiology and (3) endocrinology. So, hold onto your parts, whatever they may be. It’s time for “the talk.”


BIOLOGICAL SEX: HOW YOU GET IT
Nearly everyone in middle school biology learned that if you’ve got XX chromosomes, you’re a female; if you’ve got XY, you’re a male. This tired simplification is great for teaching the importance of chromosomes but betrays the true nature of biological sex. The popular belief that your sex arises only from your chromosomal makeup is wrong. The truth is, your biological sex isn’t carved in stone, but a living system with the potential for change.
Why? Because biological sex is far more complicated than XX or XY (or XXY, or just X). XX individuals could present with male gonads. XY individuals can have ovaries. How? Through a set of complex genetic signals that, in the course of a human’s development, begins with a small group of cells called the bipotential primordium and a gene called SRY.
A newly fertilized embryo initially develops without any indication of its sex. At around five weeks, a group of cells clump together to form the bipotential primordium. These cells are neither male nor female but have the potential to turn into testes, ovaries or neither. After the primordium forms, SRY—a gene on the Y chromosome discovered in 1990, thanks to the participation of intersex XX males and XY females—might be activated.*
Though it is still not fully understood, we know SRY plays a role in pushing the primordium toward male gonads. But SRY is not a simple on/off switch, it’s a precisely timed start signal, the first chord of the “male gonad” symphony. A group of cells (instrument sections) must all express SRY (notes of the chord), at the right time (conductor?). Without that first chord, the embryo will play a different symphony: female gonads, or something in between.

And there’s more! While brief and coordinated SRY-activation initiates the process of male-sex differentiation, genes like DMRT1 and FOXL2 maintain certain sexual characteristics during adulthood. If these genes stop functioning, gonads can change and exhibit characteristics of the opposite sex. Without these players constantly active, certain components of your biological sex can change.
There’s still more! SRY, DMRT1, and FOXL2 aren’t directly involved with other aspects of biological sex. Secondary sex characteristics—penis, vagina, appearance, behavior—arise later, from hormones, environment, experience, and genes interacting. To explore this, we move from the body to the brain, where biology becomes behavior.
THE BRAIN: WHERE STUFF GETS “MADE UP”

When the biology gets too complicated, some point to differences between brains of males and females as proof of the sexual binary. But a half century of empirical research has repeatedly challenged the idea that brain biology is simply XY = male brain or XX = female brain. In other words, there is no such thing as “the male brain” or “the female brain.” This is not to say that there are no observable differences. Certain brain characteristics can be sexually dimorphic: observable average differences across males and females. But like biological sex, pointing to “brain sex” as the explanation for these differences is wrong and hinders scientific research.
Let’s just take the most famous example of sexual dimorphism in the brain: the sexually dimorphic nucleus of the preoptic area (sdnPOA). This tiny brain area with a disproportionately sized name is slightly larger in males than in females. But it’s unclear if that size difference indicates distinctly wired sdnPOAs in males versus females, or if—as with the bipotential primordium—the same wiring is functionally weighted toward opposite ends of a spectrum. Throw in the observation that the sdnPOA in gay men is closer to that of straight females than straight males, and the idea of “the male brain” falls apart.

Trying to link sex, sex chromosomes and sexual dimorphism is also useless for understanding other brain properties. The hormone vasopressin is dimorphic but is linked to both behavioral differences and similarities across sex. Simply put, the idea of a sexual binary isn’t scientifically useful, and nowhere is this more obvious than in the brain. It also happens that transgender people have the brains to prove it.
It’s easy to see sexual dimorphisms and conclude that the brain is binary; easy, but wrong. Thanks to the participation of trans people in research, we have expanded our understanding of how brain structure, sex and gender interact. For some properties like brain volume and connectivity, trans people possessed values in between those typical of cisgender males and females, both before and after transitioning. Another study found that for certain brain regions, trans individuals appeared similar to cis-individuals with the same gender identity. In that same study, researchers found specific areas of the brain where trans people seemed closer to those with the same assigned sex at birth. Other researchers discovered that trans people have unique structural differences from cis-individuals.

THE BODY AND THE BRAIN AND THE HORMONES BETWIXT
As if the brain and body weren’t complicated enough, another biological factor influences the expression of biological sex in an individual: hormones. Anyone who has gone through puberty has felt the power of hormones firsthand. But like all things biology, hormones cannot be limited to the pubescent idea of “estrogen = female and testosterone = male.”
For one thing, all humans possess levels of estrogen, progesterone and testosterone with sex differences not as prominent as is popularly thought. During infancy and prepubescence, these hormones sit in a bipotential range, with no marked sex differences. Through puberty, certain sex hormones like estrogen, progesterone and testosterone become weighted toward one end of a spectrum. But in developed adults, estrogen and progesterone levels are on average similar between males and nonpregnant females. And while testosterone exhibits the largest difference between adult males and females, heritability studies have found that genetics (X vs. Y) only explains about 56 percent of an individual’s testosterone, suggesting many other influences on hormones. Furthermore, measurements of sex hormones levels in any one individual wildly vary across the range of “average” values regardless of how close or spread apart you take the measurements. The binary sex model not only insufficiently predicts the presence of hormones but is useless in describing factors that influence them.

Environmental, social and behavioral factors also influence hormones in both males and females, complicating the idea that hormones determine sex. Progesterone changes in response to typically male-coded social situations that involve dominance and competition. Estrogen, typically linked to feminine-coded behavior, also plays a role in masculine-coded dominance/power social scenarios. Though testosterone levels are different between males and females on average, many external factors can change these levels, such as whether or not a person is raising a child. Differing testosterone levels in both men and women can predict certain parenting behaviors. Even the content of a sexual fantasy can change testosterone levels. The fact is, behavior and environment—like cultural gender norms and expectations—influence sex-related hormones, and the biology of the body and brain itself.

SCIENCE AND SOCIETY: BETTER TOGETHER
While this is a small overview, the science is clear and conclusive: sex is not binary, transgender people are real. It is time that we acknowledge this. Defining a person’s sex identity using decontextualized “facts” is unscientific and dehumanizing. The trans experience provides essential insights into the science of sex and scientifically demonstrates that uncommon and atypical phenomena are vital for a successful living system. Even the scientific endeavor itself is quantifiably better when it is more inclusive and diverse. So, no matter what a pundit, politician or internet troll may say, trans people are an indispensable part of our living reality.
Transgender humans represent the complexity and diversity that are fundamental features of life, evolution and nature itself. That is a fact."

Either someone has a Y chromosome or someone doesn’t. I’m open to debate on what it means to have trisomy X, Turner’s, XYY, and so on. But normally we are either XX or XY. Sex is either binary or it’s a genetic disorder that more or less causes problems if it’s even obvious. Anything else is made-up fantasy.

I don’t dispute that some males don’t look like males. I don’t dispute that there are other issues that blur the outward appearance of sex. I don’t dispute that some men would rather be women. But objectively speaking, genetics determines sex.

I do feel like there is an over-emphasis on "gender norms." A man doesn't have to be macho in order to be a man; nor does a woman have to be fluffy-feminine in order to be a woman.

As already stated, SRY is more relevant than a Y chromosome. But that’s still not objective. You can objectively tell whether someone has a functioning copy of SRY, but you cannot objectively say “and this makes them male”. Ultimately whether one prioritises one genotype over another, or a genotype over a phenotype, or one phenotype over another, is a judgement call that reflects one’s own preferences. Definitions are not objective, they are socially constructed...