Yeah, I know, only two. Still, for me it's not the same when the rest that look like a alien species just are normal. Let's take our planet as an example. Non of the different species have the same equipment on earth either. Therefore it's not logical for me. Maybe I'm a bit strange in my nuggin.
I did just remeber, there are some VN that have the option to have "normal" or species spesifick geneitals, and a SFW option. But I gues it's a lot of work to implement it when the VN has come so far in development.