For some reason I had this thought that robots who were made to be artificial incubators actually look like something that is the least bit humanoid. Like they might end up looking like a mobile (or imobile) metal womb jar thing. Mostly so that humans don't get weirded out or have to fight for rights with the robot, hahaha.

It's okay to have a pregnancy fetish headcanon though I don't really see this happening with robots before ZX time either.

Also I had figured that 'robot DNA' isn't really like ours, and is probably just a program and/or strings of code that contains the physical and mental specs of a reploid, so that if they have their soul / cyber elf / DNA that you can basically recreate that reploid perfectly if you wanted to. (though according to X6, apparently X and Zero are unable to be studied or copied and understood perfectly from what I can remember KEK)