I don’t wear jewelry and I can’t figure out what good an RFID implant can possibly be for down there. But if I have to choose something useless to do with it, I’ll take the implant. It might even be a good excuse to make some kind of induction cockring, see if the missus likes it as an aiming beacon in the dark.
A larger skin tunnel in my hand to hold a payment chip is something I’ve been thinking about though.