I'm a fan of Titanium as well. I found out a few years ago that I'm allergic to nickel. I cannot wear a regular gold, silver, or platinum wedding band, as they use nickel as hardeners - I finally found titanium wedding bands.
Stainless steel contains nickel as well - so I had to find a watch with a titanium back and band. Heck, even the cheap metal they make the snaps out of in a pair of jeans will cause me a problem (the exposed metal on the rear of the snap rests against your skin, if you don't have a shirt tucked in).
Prolonged exposure (hours and hours) results in large blisters forming on my skin that take weeks to heal.
Normal use of firearms isn't a problem, but I've grown to like titanium for other uses so it's a natural evolution for me.
