Think about what you're saying. People are not in relationships for any number of reasons, and they can't just decide suddenly to be in one. Suggesting that a woman should have sex outside a relationship, with a man she is probably not attracted to just in order to get pregnant (and let's assume that for most people that would have to happen a LOT of times) is really problematic. Both for the two people involved in terms of having to put themselves through this, and also because the male partner would have parental rights.
In the country I live in, fertility treatment including IVF is available and funded for any woman who needs it to get pregnant, no matter what her relationship status (you pay for donor sperm if needed, and you co-pay for medication; IVF is only available after other treatments like multiple IUIs have failed).
I see this as a feminist issue. Having spent ten years trying to find a life partner and not succeeding, I was able to have a child on my own during my fertile years, safely, without having to have risky sex with someone I am not interested in (and I was also not tempted to pursue unsuitable relationships just because the biological clock was ticking). Yes, my kid is growing up without a father in our home. But he has many good male role models among our close friends, and also has several friends with a similar family setup. Perhaps it's not ideal, but if this forum is anything to go by there are plenty of kids with a far less positive family situation.