I think you are going to have to specify "taboo".
Polygamy and polyandry are what naysayers against gay marriage said would happen if it were allowed. I think that may be the next one to fall as, again, it falls into consenting adults wanting to form a legal bond.
But beyond that, what taboos are we talking about? A guy marrying his sister? A grown woman marrying a 12 year old? Beyond those limits, I can't think of any others that need be in place.
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