Its an interesting question I must say. For me it is mainly interesting because I tend to play devils advocate against whatever the consensus of the thread is up to the point I decide to post. This is one of the few occasions that its really difficult for me to offer up an opposing argument.
In the brief research I did (yeah Im another one who was oblivious that this even existed) I learned that there are basically 3 types of this process. Two of which result in either whole or partial removal of a female sexual organ in the Clit. Which that makes it seem almost akin to castration.
Now before I say this, I am not approving of this in any way shape or form. With that said. after seeing a sample picture, I can understand how this came about. I can envision some dumbass thinking to themselves " God that thing looks so ugly, it looks like an open bleeding wound, maybe it should be sewn up." on a purely esthetic level it can be argued it looks better, but my god, If your worried about what it looks like, your totally doin it rong, cause it never has been about what it looks like, its about what it feels like. The phrase "Bumpin uglies" comes to mind.
I think the most disturbing part of this is the notion that this happens to young girls, and the parents (presumably the father) are/is really concerned what his daughter looks like down there. Are they mutilating their daughters for their own sake? or someone elses?
OT: As bad as this is, its interesting to know that some women are in essence doing the same thing to themselves with rejuvenation surgery. (Yeah I refuse to use the V word because, I hate how the media uses the clinical term in places it does not belong.) Some women are actually electing to mutilate themselves in a somewhat similar fashion (though no where near as extreme) all because of a either a massive case of roast beef, Cabbage roll or old fashioned Barbara Bush lips (kudos if you know the reference)
Anyway.. Thank you OP, you have offered up a topic I actually had to not only think about but do research and thus in the process learned something. Kinda wish I hadn't but I would rather be disturbed and knowledgable than unshaken and ignorant.
Edit: Oh on male circum. I am cut, and I would argue that it does have the potential to be more sanitary. I would also argue that the notion of desensitization is utter bullshit. Thankfully I am getting to a stage in my life where my libido is decreasing, and alot more sensitive than I would want to be.