If that kind of pressure will force you into choices you don't want, it will be better to rethink the idea of going into marriage in the first place.
I live in a conservative Islamic society, and it's not part of its culture for a man and woman to live together in a free relationship without the formal commitment of marriage. While there are those who prefer free relationships, they live in big cities where it's overcrowded and no one cares about each other. However, they're always wary that their families might discover the story or that someone might notice and exploit it to blackmail them. A few years ago, in one of the major cities, the police would raid apartments rented by male students, and if they found a single girl, they would accuse them of prostitution. This was similar to the morality police. However, these practices have now ceased, but the culture of society still rejects a man and woman living together without marriage.
Personally, I don't see any problem with being in an open relationship with a woman, but I fear social stigma for both me and her, as my reputation in society is a primary criterion in a conservative Eastern environment, and I imagine most of you can understand this. The whole point is that I want to live with a woman who will be a life partner without having children. Society and families won't ask too much about not having children, and I can then respond that this is God's will, then everyone will remain silent convainced.
As for the question, "Why don't you want to have children?" You can always consider it a matter of personal preference, and I'm not required to give lengthy explanations.
All I can say is that I adopt the philosophy of
anti-natalism and believe it is unfair to bring more victims to this already overcrowded world. I reiterate that this does not mean that those who have children are wrong. Each of us has our own convictions and principles, and I don't believe I'm offending anyone with these convictions, including the wife I'm seeking, because she will know this from the bigenning and accept it as a basic condition for marriage and living together. I'm not interested in passing on my genes, nor do I care much about the continuation of the human race. This has never been part of my beliefs, and it never will be.