No, never want to have them. Had a vasectomy years ago to ensure that I wouldn't ever be saddled with them.
For me and my fiance (and wife in a couple of weeks, yay!), it was more of a lifestyle choice than anything else. For her, it was two things-one, she's getting up there in years (she turns 39 on Saturday), and two, she doesn't like the notion of being saddled for the next two decades with the responsibility of raising a child, which GREATLY reduces your capability to do whatever the hell you want. This includes the following favorites:
A) sex on demand
B) sleeping in until 1:00 PM on a weekend if you feel like it.
C) Going on an impromptu vacation if there is a super-rare bird spotting or raptor irruption somewhere.
D) Moving somewhere else whenever you feel like it.
E) Peaceful, quiet evenings reading or playing games.
Some of these things you can still do if you have a kid, it's just tons tons harder. I prefer easy mode.
For me, it was all that plus the financial and freetime aspects. I've seen what parenting has done to some of the people I work with, and it's pretty scary to me. They are always running around doing stuff and have virtually no identity that's not invested in their children. Yes, they take it to the extremes but I does really scare me off from children. Also, I want to retire early ( due to the age difference between my fiance and I) from rat-race activities and, thanks to dual professional income and no children, that's looking very possible.