What exactly is the source of this definition?
Did some god somewhere say it is so, or is this just a homophobe opinion?
Either way, an illogical group of morons came up with the definition so it's too tainted to ever take seriously.
Google?

I don't think its a homophobe opinion, I guess I'm more of a traditionalist. However, I think gay couples should be able to attain the same legal rights as heterosexual married couples through Civil Unions, it just shouldn't be called marriage.