Possibly. It could very well be for the MC specifically. He's also different compared to majority of the other superhumans out there in status, as a greater spawn of a Numbered Monster.
Which is why I've said for months that I think it could be possible to breed with monsters but possibly not with humans or even superhumans. It doesn't contradict what Hero said to tiffany, much, while also still being consistent with the Minyak scene.
It's totally not because I have a weird, unbearable desire to impregnate the 4th. That thought has never entered my mind at all. I swear on my memory mommy's life.
So seeing this and other messages about pregnancy got me thinking about how it might possibly work in game (If Weird World even wants pregnancy to be a part of the game at all, and isn't using the disappearing cum/ can't get pregnant as an easy out for it) and I have an idea of how it could both work and not contradict what has been explicitly stated before.
To summarize the important information so far in roughly chronological order:
1. The MC is capable of transforming himself down to the atomic level, though genetic level alterations require a sufficient sample from a specimen first. (He has been able to do so ever since he made his own clothes for the first time, though training has been required for greater changes.)
2. It is possible for at least Greater Spawn to have children with Monsters. (As stated by the Minyak.)
3. Anything separated from the MC's body for an extended period of time disappears, be it blood, limbs, or cum. (As stated by the MC himself, and is also the reason that nobody found him out prior to Deus, as there was nothing left of him at any scene he intervened at.)
4. The time it takes for the MC's separated bits to dissolve varies due to factors such as size of what has been removed, how much energy it takes to maintain it, and where the MC deposits his cum. (From little snippets here and there from the story and side stories.)
5. The greater the level of superhuman, the less the laws of physics matter to them, and the more energy they can store. (First from Ella, then from H.E.R.O.)
6. The superhumans are sterile when it comes to regular humans and other superhumans. (As H.E.R.O. mentioned to Tiffany, who shared this with us.)
7.Every superhuman is the result of their DNA being altered partially, but not totally, by a certain monster. (As H.E.R.O. and Dr. Xanthe have been explaining in the most recent updates.[As of update .92])
So why are the various superhumans sterile? Technically they are not; their DNA is just so specifically altered that even two people with a similar "parent" monster can't definitely get each other pregnant. This results in the false conclusion that superhumans are sterile, when in actual fact they are actually different species from one another, and are too genetically different to create viable children.
So how could the MC get the various girls pregnant using this information? By making alterations to his own DNA to create genetically viable sperm which could mix together with a specific individual's egg to create a viable zygote(Ya know, the first stage of a baby). As those types of subtle changes are currently impossible, and it takes roughly 2 days for sperm to meet up with an egg in order for insemination to create a viable zygote, bare minimum it will require the 3rd, maybe the 4th evolution before such a thing could ever happen. Bar any new information that would contradict this possibility, I can't think of any other way for pregnancy to happen.
It also falls in line with what the Minyak stated, as it is possible that as a monster that breeds "children" to protect it's self, it may be capable of altering or corrupting DNA to match it's own while gaining some to most of the "parent's" better traits, allowing for more powerful "children."
But ultimately, Weird World will be the one to decide if there is going to be any pregnancy content at all in the story, pre- or post end of the main game. I think it would be cool and or interesting to write such a thing into the story, and everything needed for such a thing to happen has been set up in game right now, but maybe they don't want or like pregnancy content. I'll support the game either way, I just though I'd throw my own, more comprehensive theory of how such a thing would work in game out there for everyone to think about. I may have missed some small things here or there- it is a verbose game after all- but I don't think I missed anything that would outright contradict what I've said so far.
Also Weird World, if you are reading this and I did get it right, and you're thinking of changing things to keep it a surprise, don't. I just took from what was in the game so far and made reasonable extrapolations to create an explanation for how this would work, and it would be cool if this ended up being the or an avenue you intended to pursue. If I did give you a new idea for the game, take it, I'm not using it.