I've been answering piercing-related questions for a website. Someone asked, "Why do girls like to pierce their genitals," and this was my reply:

Well, it should be women who are wearing genital piercings, as this is a pursuit for adults.

As a professional who specializes exclusively in genital piercings, I can say that most adults get intimate piercings for one primary reason: sexual enhancement. Whether that be for their own added sensation, more stimulation for their partner, or both.

I’ve actually had female clients suffering from primary anorgasmia (never experienced an orgasm) who achieved success after receiving genital piercings! I’ve had this happen with triangle piercings and with vertical clitoral hood (VCH) piercings. Their partners and activities remained the same—the only altered variable was the piercings, which were obviously responsible for the enhanced effects.

Additionally, many of my clients seek these piercings to enhance self esteem and beautify their bodies. Also, some get genital piercings (and others) to reclaim their bodies after illness, abuse, childbirth, and other traumas. For a number of individuals, it is a combination of these motivations.

Note that female anatomy is highly variable and not all women are suited to all piercings.

Then this comment came through that I found quite interesting, and I couldn't help but respond to it myself:

Of course I understand if someone isn't attracted to genital piercings or interested in them, but the concept that getting one could be considered "cheating" was quite shocking to me. Especially as someone who performs genital piercings, I'm quite clear on it being an entirely un-erotic, clinical experience--much like piercing an earlobe or any other part. In the same vein, I have a hard time imagining that a gynological exam could be sexy in any way. Or that a partner might be concerned about this, or feel it was cheating! 

But this did bring up an unusual attitude some people have. Perhaps, to some extent that's caused by simply not being familiar with what professional piercing entails, and how professional it really can be? Or, it may be borne of insecurity or possessiveness? 

I've been asked many times for referrals to piercers, and sometimes people request a practitioner of a particular gender. While I understand that some people might feel more comfortable with one over the other, my comment is always that it is appropriate to select your piercer on the basis of their skills and experience rather than their gender.