[Kahonek]

"A recent study on homosexual relationships finds they last 1-1/2 years on average — even as homosexual groups are pushing nationwide to legalize same-sex "marriages.""

Okay. The title alone confirms everything that I just said in my post. Your point?

[visualops]

There is a difference between heterosexuals dating until they find an acceptable long-term partner, and short-term gay liasons.
Men and women enter into long-term relationships even without the benefit of marriage (common law marriage). Without getting into a discussion of the rise in the divorce rate; long-term relationships constitute the majority of adult male-female relationships. On the other hand, despite the fact that long-term gay relationships do exist, they are in the minority.
The other issue is the "equality" argument. The fact that men cannot marry men and women cannot marry women does not imply they aren't "equal". A man cannot marry his sister either. Is that not also "unequal"? After all, if they are consenting adults and promise to stay together the rest of their lives, isn't that what counts?
When decisions are made based on someone's concept of "fairness" or some sort of general all things are "equal" type of premise, then anything goes.