Question obout genders

Hi, I'm writing a SF story at the moment and I have a character doing an explanation about genders...

Someone once mentioned here that there are five genders...

Male, Female, Non-Gendered, Bi-Gendered, is there some other stuff I forgot or are those the only ones?

Does anyone have an idea about the natural occurance of genders in the population?

Thank you for your help,

Beyogi