Unappreciation. Why a man wouldn't want kids is beyond me
Most women want children, if a woman is unable to have any she's most likely to have insecurity and/or nurturing issues. As long as you're prepared to support and be there for her I don't see the issue
There's always adoption.
It's both. You get with her like cool, I don't want no kids right now anyway. Then as time go on, you like damn I want a little me. But you done invested so much time in the bytch and you love her, but she can't give u want you want a biological kid. It's even worse if she got little crumbsnatchers and you ain't got none. It's stressful.