Aside from the obvious physical distinctions, what are the essential differences between male and female? I'm disturbed by all of the gender-bending and -blending that's been promoted in society over the past few decades. I believe there are unique differences between the sexes that should be affirmed and celebrated. At the same time, I don't know exactly how to respond when friends on the other side of this issue challenge me to identify and describe them. Can you help me?