Not going to lie, I misread this as "Baby Modding" and clicked it going WTF.
But as for /that/. Yeah. It's a matter of taste. A more advanced sort of fashion, if you will. Most people are just into changing their clothes around. Some people want a more personal and/or extreme touch to it, and go with modifying their bodies in (hopefully) cosmetic and harmless ways. And much like other fashion, some people take it to an extreme or absurd level. Whereas with clothes it's more of, say...A dress made of meat, this sort of fashion's extremes tend to result in, well. The main post.
I personally am not into it. I've never done any sort of body modding. I /could/ and have considered a tasteful tattoo, maybe a small one dedicated to my religion, or a lover if I was positive it was going to be a more permanent thing. But other than that, I'll pass. I still don't get the big thing with piercings. Ow.
EDIT: Also, in response to the above, I think the first one is photoshopped. I'm not entirely sure, but there was one picture I saw like that that definitely was, and there was proof of it. Though maybe I'm thinking of a different one. Still, I thiiink it's that.