I currently have 4 piercings (down there). I have had 12 total (yes down there, see links at bottom). I had 6 when I started hobbying, but took them out and let them close up since it was such a pain to find providers even willing to try. They really don't do much for the guy, mostly psychological after the first few months. Soon after piercing your really sensitive and it can make for some very intense orgasms though.
Like the other guy said, some girls really really like sex with them, some don't care and some flat out don't like it. I like having them, I love the way they make me look and feel. I won't take them out again unless I have to.
https://en.wikipedia.org/wiki/Apadravya x1
https://en.wikipedia.org/wiki/Frenum_ladder X10 but some were repiercings
https://en.wikipedia.org/wiki/Lorum x2 duplicate where I got the same piercing done twice at different times.