I agree with everything you say here.
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>The key issue is the respect of the marriage vows and for each party, not the sexual orientation.

Absolutely. Which is why I firmly believe that marriage is the word which should be applied to that relationship.

>I do not think there is any evidence that homosexual relationships are any more stable or monogamous than heterosexual ones. People in relationships (regardless of their sexual orientation) are human and I think the percentage of successful relationships is probably very similar across the board. Just because a gay couple has taken vows does not mean that the odds of both parties in the relationship being true to their vows is any more greater in a heterosexual relationship.

I apologize if I gave the impression that I believe gay couples are more likely to honor their vows. But those that would should certainly have the opportunity to do so.