Finally--a thread where I can talk about marriage without hijacking the thread! :)
Monogamy is an important ideal to me. I think the issue of gay marriage is essential to transformation of gay culture. It is true that straights are not always the best examples of marital fidelity. However, they have to deal with the fact that there are legal consequences to cheating. Their spouse can divorce them and get half their money, take the children, the house, etc.
I think that when gay couples enter into legal civil unions or marriages and discover that cheating has more than just emotional consequences, but can damage them financially, they will start to work harder on monogamy. I look forward to the day when society accepts gays, but also expects them to get married like everyone else.
I think that the best solution to the cheating problem is this--I think that a gay couple should stand before their friends and families and make public vows of commitment, something like, oh, say, "forsaking all others, 'til death do us part." Making these vows in public, and asking for support from friends and family, doesn't guarantee success, but it helps.
Real men keep their vows. If you're a real man, your word is your bond, so you know that if you've taken vows in public, it's a matter of masculine honor to live up to them.
Remember, redonred brought this all up, not me! :)