This was a joke...
Like saying "your not a human child until you start making my life miserable"
I don't want children, I never have...I admit I am far too selfish to want to give up my own goals and desires for children, and I find most of them repulsive and annoying. And most every woman I have ever been with long-term has felt the same way, and if she didn't, then she got a stern talking-too from me and was strongly encouraged to go bark up another tree.
Some of the women I have been with did not even view their bodies as something that could produce another human life, they would have felt something "alien" would be growing inside them and were disgusted by that. But as a responsible adult I want the option there just in case. If a condom breaks, if my partner forgets to take her pills....
I would hate to have to kick a bitch down a flight of stairs to keep her from bringing another mewling child onto this planet.
but this is just my personal opinion and not to be taken as any valid point.