Don’t have kids, don’t want kids. Pretty much don’t like kids, especially little ones. Older ones who are smart and well behaved are the exceptions.
This has been true as long as I can remember–even as a small child I would tell people I didn’t want to have babies, and I hated baby dolls. They said I’d change my mind when I got older–I never did. Couple that with the fact that, although I’m female, I tend toward the masculine end of the spectrum, interests- and habits-wise, and the thought of being pregnant is not only repulsive to me, but it’s almost unthinkable (in the sense of, “women get pregnant. Not me.”)
I have no maternal instinct. Sometimes I joke that I might have made a good dad, but the whole “nurturing” thing that seems to be expected of mothers is just alien to me. The sound of babies crying and little kids shrieking (and especially little kids repeating the same thing over and over) drives me crazy. I doubt it would be different if it were my own.
Early in my days dating da spouse, I still remember a conversation we had as we drove to his home town to visit his parents for the first time. “When I have kids…” he said, and I froze. “Uh…” I replied, “We have to talk.” Despite the fact that I was in love with him, I was willing to walk away from the relationship right then and there if he had his heart set on kids. It wasn’t fair to him to deny him kids if he wanted them, but for me it was simply not an option. I don’t have many dealbreakers, but this was one.
Everything worked out well, though–we got to talking and he realized (without help from me) that the whole “when I have kids” thing was a result of a very traditional upbringing, where he was simply going along with the script, with what was expected of him. I think it was kind of an epiphany for him that he didn’t actually want kids, and he didn’t have to have them just because that was what people did.
He got a vasectomy very shortly before we were married. I offered to get fixed since I was the one with the issue, but he volunteeered (since it was easier, less expensive (we were college students) and he was as sure as I was). I grilled him pretty thoroughly on that, because I did not want to be the cause of his making such a drastic decision just because he thought it was what I wanted.
16 years later we’re still going strong, having fun, and doing well. I’d say we were in our second childhood, except I’m not sure we ever left our first one.
He used to get flack from his parents for awhile, but they’ve long since given up. I think his three siblings’ 9 children had something to do with that. It’s not like they’re hurting for grandkids.
My parents? My dad never said one way or the other, and my mom wholeheartedly supports my decision. She’s never given me even a minute of trouble about it. She thinks we made the right decision–and I suspect she knows that protests, if she had any, would fall on deaf ears anyway. 
Oh, and we do have three cats that we love dearly. Whenever we get out in public with a shrieky kid, we just look at each other, smile knowingly, and say, “kittens are quiet.” (and much cuter, in both our opinions.)