I as a PA wearer myself, I do pretty much echo eaglecowboy's words and feelings with respect to PA's, but as most PA wearers will tell you, everyone's experience is a little different each time, and not everyone will go with rings which are massive.
--Do they hurt when being put in?
Not Much at all. I would say it's more of the surprise rather than pain which you will experience.
--What's the biggest and heaviest Prince Albert ring anyone is wearing-- or has seen on another man?
I currently have a 8mm / 24mm internal diameter screw ball type ring (screw in variant of a BCR). I have seen some PA's done with a large brass padlock, which is at the most extreme end of things.
--Do most people (male or female) think Prince Albert rings are sexy??
From my GF's experience, she tells me I am the first guy she has ever been with who has got a PA, and the feeling it gives her is quite different, and very pleasing. It is certainly quite a talking point with women when you are in your local bar, and end up flopping it out on a table, as a barkeeper friend of mine used to do when asked about his
--And is it true that THE Prince Albert wore one??
It is said that the Prince did indeed have one, so as to keep the foreskin back, so fresh air could get in, and thus keep any penile smells at bay. Some info from Wikipedia here which goes into more detail about this story:
Prince Albert piercing - Wikipedia, the free encyclopedia
I have found most will settle with a ring between 6mm / 8mm thick, with an average 18mm / 22mm internal diameter (Sorry, but I do not know the equivalent g sizing system, as is most commonaly used in the states).
Some links here, which include various pic's of my own PA (sizes from 2.6mm, right up to 8mm / 24mm internal diameter), an experience story I wrote for BMEzine, and a fact sheet my piercer issued to all who had a PA done....
Pics:
Index of /stan_marsh14/1/a/PA
BMEzine story:
http://homepage.ntlworld.com/stan_marsh14/1/a/PA/1/piercing.rtf
PA Fact Sheet:
PRINCE ALBERT
....and last of all, a section on BMEzine, which gives user experiences (Both good and bad) concerning PA's:
BMEZINE: Prince Alberts
All I can say, is if YOU are considering getting a PA, is to FIRST read up on my experience, SECOND read the fact sheet, THIRD find a good and reliable piercer in your area (Getting recommendations is particularly good from those who have had one done), and FORTH....... HAVE FUN!