I regularly read the BMEzine modblog that Shannon writes and while that's pretty extreme, there are things that people do to themselves that are a lot more so. I certainly wouldn't do it myself (though the geek in me is happy at the Fremen thing), admittedly, but I think it's perfectly right for other people to be able to have it done if they so desire. I mean, hell, look at what Shannon has tattooed on himself. It's pretty icky by most people's standards.