tb, most women naturally want to get married and have children.
**EDITED**
I was not saying that once a woman has a child she isn’t obligated to raise them. I was saying they are not obligated in having them. I was comparing a woman learning to a woman davening maariv, because I think thats a closer corrolation and one that people here can relate to a little bit more.
Also, once parents have children they are BOTH obligated in raising them. Its not a women’s only thing. Women tend to do most of the “raising” because men have more time obligations (they have to go to minyan for example), so even if they are sharing the load, the man is out of the house more often for minyan.