When visiting a Caribbean island as a kid I noticed that all the locals used straws when drinking out of cans. I asked and they said that the cans got dirty when being shipped in so they used the straws to avoid putting their lips on the can.
Maybe they are right, but opening the can also dunks a piece right in the drink.
I'm old enough to remember that when I was a kid, the pop tops
detached from the can. People used to save them for charity or to make "decorative" chains. (And yes, I remember cans you had to open with a can opener, which
did dunk a piece in the drink. Usually two.)
