I'm sitting here laughing at the people saying "If you don't want kids, don't date a girl that has a kid". I am engaged to a girl with a 7 yr old daughter. We are living together. She has custody of her daughter, but the dad gets her a couple nights a week and every other weekend. I don't have any kids, I don't want kids, and I just got snipped a week and a half ago.
But wait, I just said I don't want kids. Why am I engaged to a girl that has a kid that lives with us most of the time? Well, the girl treats me like a king and is completely sane. We get along great; like we are best friends. The kid can do most things herself and will even help her mom out with chores. For the most part, the fiance does 99% of the parenting with her kid. I don't step in unless I see the need or she asks my opinion on something. I still interact with the kid and do things with her.
On the other hand, forget about doing things spur of the moment. You have to plan everything out way in advance. And even then, your plans may have to fall through. For instance, one of my buddies is having his annual wine and cheese party this Saturday. It just so happened to work out that the kid is to be with her dad this weekend. Great, we can go. Last week, his shift changed for his job. He is with the OSHP. So, now he's working weekends. Awesome. Fan-fucking-tastic. Because of that, our plans just fell through, unless we can get my fiance's parents to watch the kid. With their crazy ass work schedule, it's difficult to get them to watch the kid.
So, just because YOU don't want kids, that doesn't mean you can't date someone who has a kid. I will tell you this though, I wouldn't date a girl that has more than 1 kid.