My brothers and my boyfriend has pierced ears.
I guess it's okay if the guy can pull it off.
My younger brother is too lanky to be trying to pull of big rocks, throws off the porportion of his head.
My youngest brother, well, he's go the rock/emo look going and the earrings he chose to wear don't fit his look.
My boyfriend on the other hand can pull it off because he wears guys hoops, the small (like the ones I have on the upper portion of my ears) kind and he wears small studs.