I believe we should reserve the term "Marriage" to mean: "A legal union between two people of different sex"

This meaning does not place a value on itself, but simply helps people to understand the sex of the people in the union.

Its like the terms "****sexuality" or "Gay" when used in this context do not place a value on the sexuality but are just terms used to help people understand what form of sexuality we are talking about.

The benefit of reserving the term "marriage" to mean the union of different sexes is that we show respect to the feelings and traditional beliefs of people of faith like myself.

after all, it was a gay person who came up with the term "Domestic partnership" to describe this form on single-sex legal union after all....

I am just saying that we should make legally clarifying this different meaning to the terms to avoid a pointless debate.

Marriage - union of different sex
Domestic partnership = union of the same sex