Doctors will switch to "person with prostate" type of categories as soon as an intersex person walks in. "Man" and "Woman" are just convenient short-hands for "the common configuration". We can also usually sort pieces of cutlery into "spoon" or "fork" (let's ignore knives and chopsticks) but once upon a while you come across a spork and it'd be nonsensical to insist that there's only spoons and forks while you're straight-up looking at the exception in your very hand.

And fuck clothing designers they think all men are storks meaning I have to buy pants for overweight people then hem arse and waist. They also think that women never carry stuff around and thus don't need pockets. Seriously, fuck them.