what an interesting thread
Anyway, Impregnation, nothing much really. After seeing many game and video with impregnation tag with no pregnancy just the same as seeing people cum inside someone and leave. The end of normal sex while i imagine they take pill before or after the deed. Basically, just vanilla.
Pregnancy however, that different, I seen couple of Jav in the past that show progress from impregnation to late stage pregnancy using same female actor and it was quite the eye opener. Like other people who talking about being a conquest, they definitely right about that. Seeing a girl having sex and get pregnant from it, especially from rando or casual date, making those girl who has nothing to do with those men life carrying their child does feel quite hot and furtherly fan sense of conquest when viewer imagine doing the same as those people in that video. That one reason i guess why people think its hot.
Second reason is, sex during pregnancy, while it is safe to do the deed if you take precaution during pregnancy, its still quite risky and make it like somewhat borderline taboo. Even normally, not much people, real people who want to risk that. Which why this fetish dosent really do well among people. But its because of these reason, this perception of people usually have toward this fetish along side the risk involve, just fan up those desire especially in game or doujin. If you play it or read doujin with these fetish, they quite rough, really rough something that you wont see any of it from RL jav. Plus, in Game or doujin, depend on the line they use and story they make, it make whole lot different especially in sense of conquest and corruption, for example:
Mc: "eventhough you gonna be a mother soon, you still want to have sex, what a terrible mother you are. Apologies to your daughter in there."
Just from these line alone you can imagine the sense of conquest and corruption they have along side the visual image. You can even insert Ntr if that woman/girl doing it behind their husband back plus incest if the child she carrying was that mc child and make mother to give that child to that mc and make her pregnant as well when they grown up. It quite interesting really that there so many version out there and usually, having pregnancy or not in game can tell you alot whether that game trully be a really degenerate game or not even if that game look vanilla.