I think you don't know how often it's not one of those two, and if someone is going to get to pick, maybe we should also let individuals pick for themselves too.

Edit:

Looked at that profile...

Pretty sure you don't think at all, easiest block of the week. Have fun shouting hated into the void

You are thinking of sex. Gender comes from the same root as genre - like how you categorize books. It was initially used to define things loosely by cultural traits like "tribe" or "type" and was used in the 15 century to describe men and women in a tongue in cheek way. Basically saying "the tribe of woman" right before trying to be witty about how women don't make any sense because they are like another culture. Other uses would have been to distinguish differences between any different nations, families, groups. So your gendre could have been "English" or "From this specific village where they eat a lot of cheese" or of a social class.

The word got hijacked by Victorian sensibilities which used it euphemistically in that "tribe of" way for the word sex because having a woman saying the word sex aloud to a room in the scientific sense of the word caused monocles to shoot out of men's eyesockets at lethal speeds and early feminists needed language they could use without being censored... But the modern usage of gender is not a euphemism for sex. They are two distinct words.

Gender does not concern itself with any part of the person's body. It refers more to classification by cultural attributes. Like how you would decide if a book belongs in the mystery section or romance. Whether the book is hard or soft cover is not relevant to genre classification in the same way male /female/intersex is largely irrelevant in regards to gender classification.