According to G.K. Chesterton, the only sin is to call a green leaf gray. He was referring, at least in part, to the fact that the foundational problem with mankind is a refusal to submit to reality. More specifically, the base sin of humanity is to refuse to accept our status as a creature. We want to be the creator.
As such, we talk and act as if we have control over the very nature of things. This mindset (in a more reasonable age it would simply be referred to as the vice of pride) is on display in increasingly brazen and silly ways in our culture.
We are all familiar with it by now in regards to the area of marriage and sexual ethics: “I think we have to make our own rules” said Cameron Diaz last week when asked about her relationships. But the couple that refuses to tell anyone the gender of their child for fear that they will limit his or her “freedom and choice” in the matter sets a new standard for taking this idiotic notion to its logical ends.