It apparently happens -- a google search on "gang-bang" would no doubt turn up thousands of hits. I wouldn't call it "normal," though.
From a purely clinical perspective, I honestly don't know what the attraction would be in treating a woman like a communal piece of meat.
Yeah, I know it happens, but it seems like something that is less related to sex, and more to some sort of male power thing. I can't say I understand it tho, but I wonder, would MOST men do the same thing, or would most men refuse to participate? I suppose it's too much to imagine most men would not only not participate, but try to stop it.
I would like to think the latter, but, I'm not sure.
susie