The Bible states that humanity was made in the Image of God and was given dominion over all life.  A beast may be driven by instinct and primitive needs, but humans are more than that.  Gender is an important part of that Divine Endowment.  Saying that people are nothing more than their genitals is demeaning to God and his creations. 

Sexual Biology

"Sexual Biology" refers to the anatomic and physiological differences between women & men.  For example, women have smooth skin, ovaries, breasts, vagina and labia.  Men are taller, more muscular, have testicles and a penis.  Their thicker, rougher skin carries a thick growth of coarse body & facial hair. 

Female vs male differences extend to how every cell works.  Male muscles are thicker & stronger than female muscles.  Male liver cells produce different amounts of clotting factors and other proteins, compared to women.  The male immune system doesn't respond to infections the way women respond.  ...And so on.


Hormones are the key factor in making women & men biologically different.  The female hormone estrogen promotes the formation of thin smooth skin, little hair growth and breast development. -- In ANYONE, whether they're XX or XY.  Estrogen also induces organs and cells to function according to female standards.  For men, testosterone stimulates muscle growth, skin thickening with a growth of thick coarse hair, with a male pattern of cellular activity.

What About Chromosomes?

Elementary school biology classes still teach children that XX-Chromosomes turn a person into a female, while boys are under the influence of XY-Chromosomes.  That may be what researchers believed in the 1950's, but genetic understanding has advanced far beyond those pioneering days.  It turns out, the Y-chromosome doesn't cause penises or hair to grow, nor does it encode an irresistible urge to drive trucks through mud.   -- In fact, the Y-chromosome doesn't  do much at all.   For more information, go HERE.

"Biologically sex is defined by chromosomes, internal and external genitalia, hormones, and gonads.  Chromosomal sex cannot be changed, and a uterus and ovaries cannot be constructed.  This leads some in the medical profession to conclude that hormone treatments and sex reassignment surgery can alter the evident makeup of an individual, but cannot change the individual’s innate sex."

          --  Justice Harlington Wood, Jr, Ulane v Eastern Airlines (1984)

This is the argument used to rule that transsexuals have no Civil Rights -- an opinion that is still part of the legal code in Texas.

Many people erroneously believe that biology determines whether a person is a woman or a man.  They think that biology has been irrevocably established at the time of birth, and it's constant throughout life.  Furthermore, the biologic changes that take place when a transsexual transitions are supposedly "superficial".  Their misguided conclusion:  After surgery & hormones, a man is still Really a Man.

The "Gender is Biology" Myth has been the justification for hate, violence, discrimination and exclusion of the trans population for almost 60 years.  Every point of the argument is completely false, even though it continues to be used by medical, religious and legislative "experts" around the world.


Intersexuality refers to a set of medical conditions that involve some aspect of sexual biology.  Some conditions are associated with chromosomal differences (ie, women with XY Chromosomes; men with XX Chromosomes.)  Other conditions affect genital appearance -- a woman with a penis or a man with a vagina.  ...And so on.  For every aspect of sexual biology, there's at least one intersexual condition that scrambles it.

Although all intersexuals have their condition from birth, only about half are AWARE that they have a condition.  These stealth intersexuals are discovered by accident during testing for some unrelated problem.  ...Maybe after living a life as a married man with children.  

At least he THOUGHT he was a man.

Biology has nothing to do with determining female vs male. 

There are many women with a penis;  there are many women with XY chromosomes.   

There are many men with a vagina;  there are many men with XX chromosomes.

If a vagina is found, it doesn't turn a man into a woman.

Human Sexuality Summary

Genderrefers to an individual’s core personality.  It’s established early in fetal development and never changes throughout life.

Gender Identity is an individual’s innate sense of being female, male or somewhere in between.  It also forms early in fetal development and can’t be changed.

Gender Expressionrefers to an individual’s appearance:  clothes, hair styling, mannerisms, etc.  It should communicate one’s inner feelings & values to others – that is, their gender and gender identity.  Whenever it doesn’t, an individual feels distress.

Biologic Sex

The Gender Portal

Human biology is a vast and complex subject with countless components: 

Anatomy – What you can see with the naked eye:  Arms, legs, head, genitals, muscles, skeleton, organs, etc.

Microanatomy – Anatomy through a microscope:  Muscle cells, brain cells, skin cells, liver cells, kidney cells, testicular cells, ovarian cells, etc.

Physiology – The chemistry of how it all works:  Hormone levels, glucose levels, protein levels, waste products, sodium levels, potassium levels, calcium levels, etc.

Molecular Physiology – How individual cells work:  Chromosomes, enzymes, cellular receptors, cytokines, inhibitors, transport proteins, RNA transcripts, etc

Brain - A woman's brain is structurally and functionally different from a man's brain.  For example, females have a larger frontal lobe (problem solving), while men have a larger parietal cortex (spatial perception).  In addition, all brains have about a dozen gender-determination nuclei (small clusters of cells).  Men & women differ in the size and shape of these nuclei.  More about brain differences can be found HERE.

What is Biologic Sex?

Most Texans are Neuter

The bottom line is, "normal sexual biology" doesn't really exist.   Everyone has some biologic factor that's "out of the normal range."  And some of these factors may be shockingly significant -- like a man discovering he has XX-chromosomes when he's twenty years old.  Even the handful of people who are "mostly normal" will fall out of the normal range within ten years.

Biologic sex is a spectrum.  A few people have "mostly normal" male biology (but only in their 20's & 30's), a few others have "mostly normal" female biology (only in their late teens & 20's), and then there's the vast majority with high levels or low levels, fertility problems, erectile dysfunction and all the rest.

Return to Justice Wood's legal proclamation:  Under Texan law, a Real Woman must have XX-Chromosomes, a uterus, & functional ovaries (without a history of medical intervention), normal estrogen & testosterone levels; and she must be fully fertile.  Likewise, a Real Man must have XY-Chromosomes, a hairy chest, big strong muscles, two normal testicles (without hydrocoele or hernia), a large fully-functional penis, normal estrogen & testosterone levels; and he too must be fully fertile.

Youth have no sex or gender -- or Civil Rights -- prior to puberty.  Post-menopausal?  Hysterectomy?  Ovarian cysts? Flat chest or breast augmentation?  Intersexual?  Penile hypospadias?  Hernia?  Hydrocoele?  Small penis?  Any hint of infertility?  -- All are neuter without rights.  Senior citizens needn't even bother to ask.

Ironically, Justice Wood itself wasn't even a Real Man.

Biologic Diversity

Okay, so women are biologically different from men.  No big surprise there:  most people figure out that part about the time of puberty.  But all women have basically the same biology, right?   ...And all men have the same body parts, too?

WRONG!   There's infinite biologic variety within the population of women, mirrored by a similar variety among men.  

Some women are tall, others are short.  Some women have large breasts, while others are flat-chested.   Skin color, hair color, eye color....  Yet they're all women

Some women have type A blood, others are Type B, while still others don't have ANY blood type ("Type O") One woman might be born with a robust immune system, so they rarely get sick.  Another might have poor immunity, so they're sick all the time.

And in the area of sexual biology, some women produce high levels of estrogen (larger breasts), while others have low levels (flat chest and infertility.)  And some women produce high levels of the MALE hormone testosterone -- causing dense growth of coarse hair, unusually strong muscles and clitoral enlargement to the point it may be mistaken for a penis.

          Yet they're all women..  (Of course, men have similar diversity.)

Biology is Constantly Changing

At birth, girls and boys appear to have similar bodies.  ...Until puberty strikes:  young girls develop breasts and begin menstruating.  Young boys develop body hair, penile enlargement and their voice deepens.   By the end of puberty, women and men have very different anatomies.

Then, around the age of 40 - 50, women hit menopause.  They stop menstruating and become infertile.

During their senior years, both women and men experience a gradual decrease in hormone levels,  These shifts cause many men to develop breasts (gynomastia), their penis & testicles shrink, and they experience sexual dysfunction.  Women notice breast shrinkage.

Surgery & Trauma

In addition to differences due to aging, people of either sex may encounter diseases that alter their sexual anatomy:  breast cancer, testicular cancer, ovarian cysts, tissue infections, etc.  Almost half of all western women undergo hysterectomy at some point in their lives (for a variety of reasons) -- and many of those have their ovaries removed at the same time.

And finally, more than 3.9 million people in America suffer trauma from motor vehicle accidents each year.   Add to that people who are injured from falls and all the other injuries that might happen in the course of life.  Any of these traumatic events can lead to a loss of sexual organs or a change in sexual biology.

Biologic Sexis the fourth major component of every person's sexuality.  It's completely separate from Gender and Gender Identity.   Anatomy is physical:  it provides the tools for sexual functioning, while Gender (personality) provides the why, where, how, & when those tools will be used.  Gender is what makes every individual unique.  Anatomy doesn't cause Gender, and Gender doesn't control anatomy. 

Unfortunately, mixing up Gender & Biologic Sex is the most common error made in the area of human sexuality.   Always be sure which component is actually the topic under discussion.

The New Gender Paradigm