About that, I don't know the idea the dev has atm, but I hope some plot of to why he can do it is made. Personally something like genetic varation (Evolution theory of Darwin and stuff) would be nice. You know, like the organism adapting to the dog due several times doing it. Species adapting to another species breeding to be able to survive.
I know the game it's already somewhat on that direction, but that organism change as plot would emphasise the "corruption theme" on a game of this nature. But that depends on what the dev has on his mind of course. As long it isn't a bland "girl pregnant just to please the player" I'm fine with it.