Adem and pregnancy

I finished the second book recently and overall like it, but I found funny that what has most stuck to my head is that one line where a girl tells kvothe about hoy the adem believe pregnancy work.

It shock me because imo the world rothfuss creates feels real and very thoughtfully made. But come on, there is zero way a society as advance as the adem are have not figured out some basics of reproduction.

It's just a tiny detail that feels so dumb it scratches my brain.