@ Tdintale.  Obviously I didn't make myself clear.  The disbelief is that there is something that can be called traditional marriage, as traditionally people have done things differently from the way we have done them the past couple of centuries.  Arranged marriages, kinship-cousin-marriages, polygyny, marriage at 12 years old, none of which are now incorporated as 'traditional marriage', but all of which are part of the tradition of marriage - which some argue also includes historical instances of same-sex marriage.     