Gorrath said:
As a question in return, why do you doubt it's a common fantasy?
First, gonna second Phasmal here, even women who do want to be pregnant generally don't actually want to be pregnant, they want to carry and raise a child, maybe a few children. There are a few, very very few, women who actively enjoy being pregnant for the sake of it, but they are quite rare.
Second, yes there are women out there with the fantasy. The key idea here is that it is a fantasy, and a sexual fantasy at that. Many sexual fantasies are things the person would never, ever actually want to happen to them.
I mean, I would love to carry and give birth to a child, even though it is not an option for me personally. But forced impregnation? That would be terrible. And it would have to be forced because there is no way I would ever consent to the scenario. Not even to save the human race, and besides the gene pool would be way too shallow for the human race to survive. I would do everything in my power to kill myself rather than go through with it. On the other hand, there is an alternate solution I would accept. I would dedicate my body to science.
I am willing to die to ensure the survival of the human race, just not endure that for the rest of my life. Put me in a medical coma, then kill the non vital parts of my brain in such a way that my body is not damaged. My body is, after all, the only important part of me in this scenario, and it has been demonstrated that a brain dead woman can carry a baby from the early weeks of pregnancy all the way to term and the baby will be perfectly fine. I would be legally dead, and dead in every way that matters to me, and they can use my brain dead body in whatever way will be most beneficial to the human race.
Basically, if you need my body to save the human race, I can deal with that. But for the love of god kill me first.
OP: Personally, I would hate the scenario. I am bi in that there are some men I would have sex with and certainly enjoy it, but I lean heavily towards women. So with all the women wiped out... that would suck hard.
I think the scenario only works for straight and maybe bi men when it is the men who have been wiped out, and even then it works best as simply a low ratio, like 1 man for each 9 women. The real fantasy there is that being comparatively rare the value of any man as a partner is significantly higher than they might otherwise be. It is just a round about being desirable fantasy, one that involves changing the world instead of yourself, with a built in many partners aspect. This doesn't work for women due to the above discussion. If every woman had to have 10 genetically diverse babies to keep the world going it would suck.
But anyway, with simply a low ration way no one man carries a major burden of propagating the species. In order to keep population growth neutral each man would have to have 10 genetically diverse children, which is entirely doable in a very short time span by normal means if that man has multiple partners, and easily done if we take into account modern medicine and artificial insemination. It would place virtually no burden on the men and vastly increase their desirability as a partner by the law of supply and demand, plus we would likely see a major shift in values in such a way that a man sleeping around would be even more ok than it is now.
On the other hand, all major political power would shift to women. We would make up 9 out of 10 of the population in everything, and that translates to all the power everywhere. Men would be seen as rarer and possibly more valuable, but that value would not be inherent to them as a person, just merely value as a rare commodity - value as an object, not a person.