@Googlebonker Remember chromosomes? Those are a thing. A lot of people forget this (or ignore it).
@Googlebonker Thankfully, we now know that chromosomes more often than not dictate genitalia.
The reason I use chromosomes as a standard rather than genitalia in regards to sex is because, while anybody can mutilate themselves, no one can change their chromosomes.
@realcaseyrollins Chromosomal gender identification wasn't a thing until 1905. It used to be that person's gender was determined by his or her genitalia. If someone had ambiguous genitalia, they were to live as a eunuch. "Eunuch" isn't a third gender, it simply means that your gender is visually indeterminate. Eunuchs were to have no romantic and/or sexual relationships to avoid homosexuality.