And it's not an obvious answer, because throughout the animal kingdom, it's actually determined in different ways. In some creatures, especially some types of reptiles, it's environmental. Not all reptiles, but certain cases of it. It could be maybe the temperature in which the embryo develops will dictate whether it turns into a male or female or other environmental factors. And in other types of animals, especially mammals, of which we are one example, it's a genetic basis.
Cassidy your so beautiful and extremely sexy. You have a looks of a goddess and your smile is infectious. Your the most beautiful and seusual woman I've ever seen on porn, or maybe ever. I wish woman like yourself were in the real world. But I've yet to see a woman whom can match your qualities. Your simply the most beautiful woman.