Genital piercings, or intimate piercings, are meant to increase pleasure and arousal. They can be on the nipples, labia, dick or perineum.
Of course, there are risks associated with these kind of piercings. One should go to a licensed piercer, who has experience in this area. You should follow all instructions for maintaining hygiene in the area. Even the simplest piercings can get infected, so good aftercare is very important.
You've probably heard of the Prince Albert, a ring through the urethra, and thought it a new trend but actually genital piercings have a long history in southern Indian cultures. Size, shape and location all vary endlessly for genital piercings. Nowadays, people who don't want to commit to a real piercing sometimes buy genital clips for a temporary taste of the same sensations.
More bold body modifications are discussed here:
Body Art, Tattoos, Sweet Pain p>