that's sort of a good question, how do humans and humanoids even reproduce if seemingly every single 'female' has a (huge) dick?
That is a bit of a misconception about the setting! The station has a fairly large futa population (you get an explanation of why in-game), but they are nowhere near making the entirety of the demographics there. I've been putting both "regular" men and women in the backgrounds for a while now. The R5 continues in the same manner, for example, the people here:
Or here:
That said, the game is a
futa on femboy; therefore, that is its main focus!
If you are asking about these things regarding other species or humanity as a whole, I have already posted about it ITT in greater detail; I'm sure you can find these posts!