Same-sex marriage advocates will tell you "love is love". That there is zero difference between men and women, apart from sexual organs. But the differences between genders are far more than what meets the eye. Scientifically, our brains show major genetic differences as well.

Mothers and fathers play unique roles in the lives of their children because ultimately, they are complementary beings.

There is a growing number of people in our nation today who think that sex (that is, maleness and femaleness) is not an objective biological reality, but rather a social construct.

Those who reject the objectivity of sex will often say that although male and female bodies may have some differences between them, our brains are just the same. One man, who is currently raising three “genderless children,” argued, “If you really want to get to know someone, you don’t ask what’s between their legs.”

As it turns out, male and female brains are biologically different.

In 2004 an all-star team of fourteen neuroscientists, from the University of California, the University of Michigan, and Stanford University, published findings showing that male and female brains are genetically different.

The differences between male and female brains affect many aspects of our behavior, including memory, emotion, vision and hearing, how we handle stress… and even the toys we like to play with.

In 2002, Melissa Hines of City University London, and Gerianne M. Alexander of Texas A&M University decided to conduct experiments on vervet monkeys, one of our closest biological cousins. They found that the monkeys showed “sex differences in toy preferences similar to those documented previously in children.” The boy monkeys typically preferred playing with cars and balls, while the female monkeys preferred playing with dolls and pots. (And they didn’t have parents or toy catalogues telling them which they should prefer.) -MattFradd.com