It's no big deal. I have seen plenty of scarification, brandings, and much heavier body mods. As long as they understand the consequences of getting the work done and aren't being forced to do it, then it is just another medium for expression that doesn't bother me one bit. All the power to consenting adults who choose to heavily modify themselves. It isn't for me to judge one way or another about someone else's choices that don't affect me. Just 50 years ago, it was almost unheard of for a guy to have long hair, a tattoo, or a peircing without them being branded as outcasts, criminals, or something equally as deplorable. Now, you wouldn't look twice.
I think it is much more offensive the cultures and persons who force others to participate in tattooing, scarification, branding, and genital mutilation against their will in order to fulfill an agenda. There are still millions of women in the world who still have their gentitalia mutilated to prevent them from receiving any ****** pleasure or be attractive to anyone except their husbands.