Why did Optimus Prime Stay dying?

[Soundwave]

Oh I knew that story. But what about Elita-One? and the others?

All the other females (I know women hate that word ) are from the colony worlds that the titans settled after they left Cybertron. Elita-One is from Carcer, Chromia is from Caminus, Moonracer is from Velocitron.

 

[Neuromancer]

All the other females (I know women hate that word ) are from the colony worlds that the titans settled after they left Cybertron. Elita-One is from Carcer, Chromia is from Caminus, Moonracer is from Velocitron.

So they're not originally cybertronian?

 

[Soundwave]

So they're not originally cybertronian?

That's correct. Still Transformers, but they all missed the war. They look at Cybertronians like " You fought a war for four million years???"

 

[Neuromancer]

That's correct. Still Transformers, but they all missed the war. They look at Cybertronians like " You fought a war for four million years???"

But why are they female gendered? Did they ever explain that? I mean the don't have any reproductive organs.

 

[Soundwave]

But why are they female gendered? Did they ever explain that? I mean the don't have any reproductive organs.

This is the best explanation I could find:

Female Transformer - Transformers Wiki