Take a look at this couple with armband tattoos and see if you can tell which one is real and which is a fake. Then come back and read the rest of this post. A good quality waterslide temporary tattoo can be very hard to distinguish from a real tattoo.
Actually, this was a trick question. Both of the tattoos are temporary tattoos. Live your fantasy for a few hours or a few days. There's no pain, no blood, and no lifetime commitment.