The same way a monacle is kept in place. A little squeeze and a lot of concentration. And practice.
I don't have any piercings myself, but i kind of like the idea of the pierced glasses. One would have to watch one's tongue whilst wearing 'em, though...
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Say say, oh playmate
i cannot play with you
my dolly's got the flu
boo hoo hoo hoo hoo hoo
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