I like being single *now* since it means more freedom and, frankly, a lot less responsibility. I never, at any point in my life, actually believed that I would ever get married, but it is only recently that the real impact of this has hit home. Sure, it's fun now, but someday my relatives--who are all older than me--will be dead, and I'll just be some old maid trying to get by on her own. So while I can certainly live without "romance" I think it would be a lot more practical and satisfying to go through life with a partner.
Regarding kids...there's crucial difference between children as an abstract concept and as YOUR children. Nobody particularly likes them in theory, or sitting next to you on the plane, but I think it's different when you're holding your own little DNA-carrier. (Thus saith the old maid--like I would know, huh?) I wouldn't mind having kids, but I have such a bleak view of the future that I am seriously uncomfortable with the idea of bringing anyone into the world now.
(On the other hand, life is always hard, and if everyone were as defeatist as me then we'd be extinct by now.)
On a more practical level, I wouldn't want to have children unless I was sure that I could stay with them and home-school them. School was bad enough when I didn't understand what they were doing to me; now that I know what they're up to I couldn't bear to turn my own kids over. Given the weird disdain that this society has for "housewives" I doubt that I could find a man willing to support this.