Gender, Nature, Sex
Each life has a soul, and that soul determines what gender you are. It's not so much about your body parts, it's more about what's inside that matters.
Picture your own soul and your own life. Listen to what your soul says about your gender and live your life to the fullest!
せい, しょう
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Once you've decided what your gender is, the Shougun (しょう) comes to your house, lays his saber (せい) on your shoulders, and then it's official! It's in all the newspapers, there's a parade, and everyone is patting you on the back because you did it!
The next time you get one of those surveys where you have to choose your gender just think back to that time in your life when the Shougun came and officiated your gender with his saber. Ahh, what lovely memories.