While I agree that gays should have the same rights as straights, it seems to me to be a very big stretch to call it a 'natural right'. I'm inclined to agree with Bentham on this issue that a 'natural right' is nonsense on stilts. For most of human history people did not have a 'natural right to marry'. Marriages were arranged by parents and still are in many parts of the world. Obtaining the 'right' to marry who one chooses is a big advance in social and political rights which shifts power from the older generations to the younger generations and may produce more happiness than having one's spouse chosen by someone else. However, it's no more a natural right, than voting is a natural right.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13