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It is not sexist. Thinking it is sexist requires some mental gymnastics, and actively searching something to nitpick about is, I would say, in my humble opinion, everything wrong with postmodernism...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/37698 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It is not sexist. Thinking it is sexist requires some mental gymnastics, and actively searching something to nitpick about is, I would say, in my humble opinion, everything wrong with postmodernism. Building on @user49466's answer, I will expand on why this concept is far from sexist. - Reproduction is generally a good thing for our species and society, otherwise we wouldn't be here today. If you can accept as an axiom that perpetuating our existence is good, we can continue to the next point. - Not being able to reproduce is not so good. Naturally, genetic replication isn't the only way someone has to contribute to society, so lacking that ability is far from an impedance to being useful to society. In fact, even if you happen to be unable to continue your genetic line, you can still continue your memetic line by mentoring someone else, usually a child. Ultimately, memes are what make society, so I would argue laying good foundations via implanting the thoughts you are so proud of is way more important than continuing your genetic imprint. Thing is, being able to reproduce is good for us as species, as it is the only way we have to let the human race continue existing, but individually speaking, it is not so important as trendsetting is, which can have a much bigger impact on the way mankind will develop. Doubly so if you are powerful enough to reach many people and greatly impact society, like a witch. - Sometimes, reproducing is not so good. Some people may have faulty genetics with grave incurable diseases that make them suffer in life. In those cases, deciding not to reproduce genetically may be beneficial, and would benefit much much more, both as individuals and to society, if they decided to reproduce only memetically. - Assuming any woman can become a witch through study and practice, and it is not some exclusive magical trait only certain genetic lines have (which would have probably led to extinction very early on, as their mechanics do not seem fit for the perpetration of their genes), they may decide that their extraordinary memetics can be more valuable for the world than their probably more average genetics, thus opting for changing the world with their actions than adding yet another "regular" person to the already overcrowded pool. Long story short, they have the ability to choose whether they value more their genetics or their memetics; having a choice, as commented by @user49466, is objectively superior. - For these witches, losing their reproductive abilities is actually an upgrade with downsides, not a downgrade. They have decided they preferred either the altruistic path of perpetrating their memes through a sacrifice, or the more "egoistic" (but still completely respectable, and not necessarily evil in any way) path of living a better life by sacrificing something they did not consider vital to them, which is something we do on a daily basis in less extreme instances. - Just like many women nowadays choose not to have children to purse their career (which may be highly memetic), these witches decided not to have children for this same reason. In the case of witches, there is no going back on the choice and no other way around; in the case of modern women, there may be going back, but sadly, sometimes there is no other way around, but that's a topic for another day. - The long story short is **witches value who they are and how they live over who their potential genetic offspring will be, which means these are really confident and empowered women, and probably the opposite of the concept of mysoginy. Some of these women may even have chosen to change the world with their actions, which is the epitome of empowering.** - Assuming these women become useless for not being able to reproduce IS sexist. Luckily, we can safely affirm these women have acquired the potential to have more impact in society and history than if they just decided to have children, and it was entirely their own choice. - Likewise, assuming losing the ability to reproduce is not a handicap (albeit a really small one) is disingenous. Losing any ability is bad, as useless as it is, since it limits agency, which may be vital or not. If we were to explain it with a dumb analogy, it would be like cutting your arms off in exchange for psychic powers: you may lose the ability to sense with your arms or grab things like you were used to, but you will probably still have the ability to move things or even operate objects, probably more effectively than before; likewise, witches have lost the ability to reproduce their genes, but they have gained the ability to reproduce their memes more effectively than before. Consider it a sidegrade if your genes truly are exceptional (betcha no matter how exceptional, they can't beat having witchcraft powers, anyway), an upgrade with penalties otherwise. I would say this implies women can do things better than reproducing, and still be respected and venerated for it. If anything, I would say you found a subtly feminist detail for your setting. Personally speaking, I would say genetics pale in comparison to the power of memes, so I find it fascinating that these witches are valued for their memes, rather than their genes, which more or less seems to reinforce my personal opinions. As a bonus suggestion, I would consider exploring the possibility of letting these witches have adoptive children. If some of them happen to have a maternal drive, they will probably want to take care of children, which is now only possible by adopting. Having "spiritual" daughters may be a way of perpetuating the memetics of the witch clan, which I assume they will want to do, so either schooling young girls in their arts and philosophies, or even taking them as daughters may be just the logical thing to do.