I want kids one way or another. I'm cool with adoption, but I'm a greedy bastard and would like to pass on a few genetic aptitudes if I find the right kind of willing woman. That said, if other people don't want, that's fine. But if we all stop, humanity will have to resort to cloning by the time 2120 comes around or die off. Now, some people my not care if the species survives or not, but I'm one who does - again, I'm a greedy bastard.
Outside of all that I'd rather a woman I can be with over spreading my genes. I'll even pass up on adopting for the right woman; but she'll have to damn well be the right woman and have a damn good reason for me not to. I'm not the kind of guy who just wants the kids for show, and I will put in most to all the care if needed (If I don't find someone by the time I turn 45 I'm adopting, period).