I hesitate to mention it, but I actually experienced guitar nipple when I was a teenager - so obviously I've had time to recover. I don't think one could get it from an electric guitar with a sympathetically formed back, such as my Stratocaster, btw.

I'm also a little deaf in my left ear due to playing my fiddle. My duet concertina, by contrast, seems to have done me no damage at all.

Gav