It's a simple definitional issue.....how is marriage defined. Men and women are different, and thus are treated different when the situation warrants it. Marriage has a distinct, cultural, historic, traditional, legal, and/or religious meaning throughout time and place as a union of a man and a wife or man and several wives.<quoted text>
Look, this is a simple equal rights issue.
A man has the right to marry a woman, so a woman should have the same right.
A woman should have the same right a man does, the right to marry a woman.
Can you give me a reason that should not be the case?
If its the consensus of society that marriage is simply a union of two consenting adults, there's no need to prohibit any two person, consenting adult, union, including blood relatives. Why should it matter who marries who, or who can't marry who?
Your argument seems to be no restriction, except possible number of participants, among consenting adults.
If that is so, why bother licensing marriage at all?