Judith L. Hand, Ph.D.
[A video also presents much of the material in this essay]
Why do our two sexes, in many ways, behave so differently? As Pygmalion’s professor Henry Higgins puts it, “Why can’t a woman be more like a man?”

(Rex Harrison, Audry Hepburn – “My Fair Lady”)
Here’s another, related, question. Is it possible that understanding how and why some sexual differences lead men and women, generally speaking, to make some very different social choice–is it possible that understanding why that happens could help us find solutions to a host of social nightmares? Consider these problems facing us right now….many of them genuine evils.

To avoid a dystopian future—a hell with all of these raging in full force—we’ll have to deal with these, and many more, under the pressure of ever greater numbers of people trying to make a living and raise healthy, successful, fulfilled children. In too many cases, just trying to survive. How do we do that? Can we do it?
In this essay we’re going to look through the lens of biology at a reality called sexual dimorphism. If we understand and take to heart the implications of sexual dimorphism as it relates to our social behavior, we can take giant steps in the direction of a “better” future. A future that, at minimum, reduces the effects of these social evils, and may actually avoid or eliminate many of them. A future more peaceful, more just, and even environmentally sustainable.

One of Albert Einstein’s most thoughtful insights is that the definition of insanity is to keep doing the same thing over and over again and expecting different results. Given our biology—if you will, our human nature—it’s not possible to create Utopia. But, could we shift global culture enough to not just avoid ending up living in a dystopia, but actually build an extraordinarily positive future? What behavior might we change to get less violent, more nurturing results than what we’ve produced so far? As we’ll see, understanding some key things about our biology suggests that we need to utilize some natural inclinations of women that differ significantly, in general, from some natural inclinations of men.
A primary assumption of the presentation, which offers a biological perspective, is that to create a more positive future, we need to understand ourselves better. And that means we have to answer the question, “What kind of animal are we?” We named ourselves Homo sapiens—wise man—but much of our behavior is so harmful, to ourselves and increasingly to the planet, that the word “wise” may not fit us very well. A better choice might have been Homo acutus—clever man—because there can be no doubt that we are very very clever.
During hundreds of thousands of years, our ancestors lived as simple bands of nomadic foragers.

But they came to possess behaviors that made us one of Earth’s most dominant species. And many of these behaviors weren’t based on carefully thought-out reason. They were whatever ensured the survival and reproductive success of the individuals who gave rise to us.
So, still based on biology, this presentation’s second assumption is that rather than our behavior always being guided by reason or wisdom, we need to embrace the reality that much human behavior is, in fact, guided by built-in, genetically-based, evolved predispositions/preferences/tendencies/urges, whatever you want to call them, and that they powerfully influence much of our behavior, sometimes in contradiction to what rational or wise thought suggests would be a better thing to do. And specifically, we’re going to consider how and why—in general—some of these urges are not the same for our two sexes.
The explanation does begin with sexual dimorphism. This reality shapes much of life on Earth, and as we’ll see, that includes us. The term comes from the Greek dimorphos, meaning having two forms. Most species of plants and animals have males which make sperm, which are tiny and motile, and females, which make eggs, which are comparably huge and non-motile, and have nutrients sufficient to develop into a new individual. Humans obviously fit this pattern.

There are other reproductive possibilities. Some species reproduce asexually, like this tiny water creature called a Hydra that’s sprouting a new hydra out of one side, and single-celled forms like the Amoeba which can divide by pinching itself in half, and even a lineage of female lizards that reproduce without any males. Some, like mushrooms, use spores.
But the vast majority of animals and plants—at least some time in their life cycle—reproduce sexually.
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