Then there was the guy who thought "respecting an establishment of religion" meant I had respect for something.
It was the Austrasians, that hewed on bravely through the thick of the fight, it was they who found and cut down the Saracen King.
If baby making were a standard obligation and requirement of marriage, that argument and requirement might fly. However, it is not. Marriage, as it stands today, is a contract between two people who name one another irreplaceable to each other and so united that the law treats them as one. Heterosexuals get to make that choice. Homosexuals do not.
The rights most certainly are NOT afforded equally despite the mindless repetition of that grossly over simplified statement above.