Never. I wouldn't be able to have the lifestyle that I want to have if I had kids. Heck, I don't even want pets. Or even a live-in partner. I like peace and quiet, thanks.
As for numbers, I'd like to have three, with at least one daughter. As for names, I'd like to call one of my sons (if I have any) James. That's the only definite one though. I suppose Lee sounds kind of nice too.
My middle name.