> [clitoris piercing] is done by many women.
Not many women are bult for it; and for those who are, not many want it; and for those who do, not many piercers are qualified to do it. I'm not sure what you mean by "many". It's not common.
HelmsmaN knows that both typed of piercing exist, but when people say "clit piercing", they almost always mean "clit hood piercing".