AFAB and AMAB are not biological descriptors they don't mean anything about your body. AFAB and AMAB refer to a specific event in your life: when you were assigned a gender at birth, what did they assign you. That's the only thing it means. Not substitutes for "male/female"

Someone with androgen insensitivity syndrome may have XY chromosomes and internal testes, but was assigned female at birth. That person is still AFAB/CAFAB AFAB means nothing about your body. It's a description of what you were assigned which often impacts what you were raised as

A lot of people with XXY chromosomes are AMAB.

There's also lots of AMAB people with vaginas and beasts because, you know, they got GRS and top surgery.

AFAB people can have dicks and flat chests and no uterus or ovaries. It's a *historical* marker. It describes your PAST

The acronym confuses the tense of the sentence. It becomes an adjective so you use the present tense. "is AMAB". But it would be more accurate to say Was A'd MAB. had been A'd FAB.

I saw someone talking about AFAB Bees tonight and I was just like who the fuck is assigning bees genders at birthb

I also want to add that it needs to be acknowledged that for intersex people being assigned a sex at birth isn't a mistake. Often nonconsensual surgeries are performed on them as infants or children to make their bodies more resemble dyadic bodies and which one is doctor's choice

Like that's a whole other horrifying thread but it just needs to be said when mentioning the CASABing of intersex babies

I highly recommend the blog "intersex roadshow" if you want to read more about that

Also in case you're new here

There aren't any words you can use to substitute for male or female to refer to "biological sex" because the sex binary isn't real. Not a single component of the body is Always A Certain Way for All People who are "male" or "female"

"Biologically" Male and Female are heuristic clusters of traits where _usually_ people with certain qualities have other qualities too but it's a socially constructed heuristic and many people fall through the cracks. It is not a biological reality. & also: bodies are changeable

A lot of the traits like facial hair and flat chests are actually just beauty standards that got lumped in with "biology" by colonial European chauvinists in the 1800s. A huge number of cis women shave or wax their faces to meet this beauty standard. Just like trans women.

And nearly HALF of all cis men grow breasts! Gynecomastia is EXTREMELY common. If you aren't sorting everyone by the heuristic in your head the second you see them, and looked at humans as a whole, you'd say "about 70% of all humans on earth have breasts"

So again

Assigned sex as birth describes an event in your life, what category they sorted you into based on the appearance of your genitals, which for some people they did surgery on at birth as part of that assigned process

It doesn't describe biological reality.

Humans exist along a spectrum of physical traits which can change one the course of their life. A lot of these traits tend to correlate to each other clustered around two poles on the graph, but everyone exists along the spectrum and many people exist distant from the poles.

My body is non-binary. My entire physical body has some "male" traits and some "female" traits. I'm not even considered intersex I've just always existed on the spectrum further from the sex I was assigned's common traits and then did stuff that changed my body further.