What are you having?

As an eight months pregnant woman with my fourth child, I have heard this question often in the last ten years or so. Every time, my answer is the same, "We don't know. We want to be surprised." Tonight I overheard someone asking the question and the answer was that they were going to find out next week. He explained that they were having twins and so a little preparation was necessary. Then I started thinking. Why does it really matter to know whether a woman is having a boy or girl? Is there a major difference in having one or the other? I know some people find out what they are having to prepare rooms for the baby or buy the right clothes, but I find that newborns grow so quickly that buying a whole wardrobe of gender specific clothes soon ends up in storage. As for the rooms, a newborn girl is not going to care if she shares a room with her brothers for the first few months or even the first few years. I guess I'm a little perplexed at how necessary it is to find out what we are having. We are having a baby, and it doesn't make much of a difference if it's a girl or a boy.