RisingDown,
Marriage is linked to reproduction because sex is linked to reproduction.
The logical connection between marriage and children is that every study ever done has shown that having both of their parents around offers many benefits to children. As it turns out, men and women committed to one another and their offspring are what's best for their offspring.
Marriage is based on this logical commitment for the sake of childbearing. As it turns out, healthy people who find suitable mates tend to enjoy not only committing to them, but having kids and committing to their family as well. Who knew.
Redefining the word "marriage" to mean something that it never has would not bestow social position. Many people would still believe that homosexuality is dysfunctional. Redefining a word won't change minds any more than it will enable homosexuals to procreate.
Unless any ancient people ever used the same word for marriage to describe homosexuals, it's already been well-defined. I do not enjoy these linguistic acrobatics!
A marriage is a union between a man and a woman. It just so happens that such a union is capable of creating children and families. This differs from homosexual unions, which are not marriages capable of creating families. If you have examples of people referring to homosexual relations as marriages in history, I'd love to hear them. Because those relationships just don't serve the same function. They don't have the same status because they're not of the same sort or capacity or purpose.
I'm not sure what you're basing "widely practised" on.
There were plenty of weirdo barbarians back in the day, but that didn't make them the norm.
[I wish I could obey forum rules]