For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some 'organic element' since I couldn't accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.
Sorry you have two dinguses explaining gender to you lmao
Edit: ❤️Mods
Wow the mods are amazing, they removed the comments before I even saw them.