Okay. What is the Biological Sex definition of a male?
Has a Penis? Well yes, except for intersex people, people who've had their penises amputated, people whose penis formed in a manner not considered "Normal" and so many more varieties.
Has Testicles? Well yes, except for intersex people, people who've been castrated, people whose testicles formed in a manner not considered "Normal" or whose testicles are internal and caught in a state of transition between ovaries and testicles and other varieties of tissue density, functionality, and more.
Has more testosterone? Well sure, except that "More Testosterone" covers a large number of "Biological Women" who have ovaries that don't produce as much estrogen, estrogen blockers, glands that produce larger than considered average quantities of testosterone, etc etc etc.
Genetics? Well there's XXY and XYY genetic patterns and all of it is epigenetics which is about as set in stone as ice cream in that temperature, stress, and radiation can all have profound effects on it...
Any milestone of "Biological Sex" is a waste of effort because of all the exceptions to it. So we create this elaborate web of "X Variables must be met or not the subject is not Y biological sex" when we should just be looking at the traits themselves. People with Testicles have a lower chance of ovarian cancer than people with ovaries, yes. But Male and Female as terms are socially loaded and effectively useless.
We call testicles and ovaries male and female sexual organs because it's conversationally convenient based on a shitload of racist, sexist, ignorant ass white scientists who died three hundred years ago or more.
Seriously. The way of determining whether an intersex person is going to be male or female when they're given surgery as a fucking infant before they have the ability to decide for themselves is to take a ruler to their little clit/penis structure and measure it. If it's not a certain length or longer it gets cut down into a clitoris. If it's above that length they stitch up the vagina and call the person a boy. That shit is -fucked- up.
Pluto ain't a planet and Biological Sex is pointless.