I'm still on the fence as to whether I want to have kids, but one thing I've observed about friends and relatives with children that deters me is that their whole identity seems to revolve around their little ones. Do I want that to happen to me? Not sure. I've seen how all-consuming having children can be. My sisters and closest friend, all of whom have one child, seem worn out, their social lives having bit the dust a long time ago. Most parents say things eventually get better, and that somehow you adapt. But it's obvious that having children presents a slew of opportunity costs, including not being able to go out as much and whenever you like, having less money, forgoing quietness and solitude, not being able to sleep in, and so on. What's more, it seems that once you have a baby, your identity becomes wrapped around parenthood -- now you're not John Doe, but John Doe Jr.'s dad. Those who loved and watched sports pre-kids can hardly keep up with th...