Probably won't help in your search, but this issue was discussed a while back amongst other things in this thread -
https://www.ukpunting.com/index.php?topic=213539The general consensus, myself included, was that while desirable, it certainly didn't make up for a lack of technique - which is far preferable in any event.
I'm not really one to go daft for blowjobs though, and find a good shag or wank far more stimulating for the tadger. Thus, on an even more personal note, the best thing any bird can do with that part of her body is fuck me hard and deep with her throat. I'd take that any day over any tongue-trickery - pierced, or not.