brunpi's comments

The idea that men can become women by self-decree is a niche ideological view. It's quite a stretch to call this "modern standards" when hardly anyone really believes this.

Your hypothetical male who lost his penis or was born with an underdeveloped one is clearly still male despite this. There is a misogynistic tradition going all the way back to Aristotle that women are merely deformed men, but in this day and age I hope we can move on from such ignorance.

The alternatives - that "man" and "woman" are identities that anyone of either sex can claim, or that "man" and "woman" are defined by a narrow set of cultural stereotypes - are very niche definitions that should be disregarded as, respectively, absurd and sexist.

It's because they are male, obviously.

"Man" is the word we use to describe an adult person who is male.