If you care about bioethics at all, or if you have a family, or if you plan to have a family, or it you intend to be a human being living on this planet in the next couple decades, I suggest reading this [long, but worth it] article by Dr. Leon Kass, "The Wisdom of Repugnance."
I first read it years ago and hunted it down again tonight for a speech I'm writing on embryonic stem cell research (Comm110 strikes again).
In this twisted up postmodern age, it's unusual to find someone in the secular realm who's willing to make the arguments Leon Kass makes. It's good stuff.
"Shallow are the souls that have forgotten how to shudder."