I believe that our portuguese lawyer was trying to prove is that a domino effect would happen if same-sex marraige was made legal, then it's only a matter of time before marraige between siblings or a man having more than one wife or a man who marries all his siblings becomes legal as well.
Personally, I don't buy into it. Little Tippler already mentioned why incest is wrong. Regarding polygamy, I don't see it morally wrong, but it would be inconvenient to society it's self. Like a lion and it's pride, only the most powerful will have many wives. The rest of the average men will have to be single for the rest of their lives, since the rich men married all the women.
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"I don't know that I ever wanted greatness, on its own. It seems rather like wanting to be an engineer, rather than wanting to design something - or wanting to be a writer, rather than wanting to write. It should be a by-product, not a thing in itself. Otherwise, it's just an ego trip."
Roger Zelazny
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