Yes, it is true. I did see Pierce Brosnan naked, more or less every night and in public because I was working with him at the time but it was some considerable time ago. Before I ever had the notion of writing a book or a screenplay I was heavily involved in music - what is now called folk-rock or an even newer, voguish moniker, folk-psych.
It was also the early days of the Edinburgh Festival when the pubs closed early and you couldn't get a drink for love nor money after about ten o'clock.

I had co-written an ambitious Celtic rock-opera called 'Pucka-Ri' (English translation: Goat King). I was playing in various bands but had teamed with my old oppo, Mick Flynn, to write the music and the songs and the 'Libretto'.
We found a producer/director, teamed up with a small theatre group, hired a ten-piece rock band, a brilliant jazz singer, Maggie Nichols and assorted acrobats, jugglers, goats, dogs. 'Pucka-Ri' needed a lead actor to play the part of 'One Man' in this Celtic ring cycle that sees him descend into the Celtic underworld, undergo a form of redemption, copulate with 'Midwinter Child' and be reborn as man and spirit in pure harmony with the world and the Gods.
Enter a young Pierce Brosnan. We rehearsed at the Oval House theatre where he kept his pants on before transferring to Edinburgh where 'Pucka-Ri' became one of the hits of the Fringe. 'One Man' was accompanied by a goat (a real one), but it turned out to be a nanny so Pierce had to milk her every night.

His first entrance was stone butt naked leading the goat in through the audience. He spent a long time giving the audience a good eyeful before the script had the good sense to cover up his dangly bits. This was well before 'Hair' or the liberated theatre of nudity that followed and, I can tell you, a naked Pierce Brosnan holding a goat on a leash caused gasps of astonishment and admiration.

And no, I am not going to fall into the trap of blabbing about the size of his organ. That would be a step too far and very uncool.

When the Festival was over I gave Pierce a lift back down to London in my beat-up old van. There was little to suggest what he might become. I was certainly a fan of James Bond books but never in a million years could I see him playing that part although he did have genuine charisma and was clearly ambitious.
It would nice to think that I modelled my protagonist in 'The Immortality Plot', Mike Delaney, on the Pierce I knew briefly but I didn't. I can't imagine the former US government assassin, Hong Police enforcer and esoteric monk with blistering martial art skills striding naked through an audience with or without a goat.