So they can rightfully experience the pain and hassle of divorce?
It does seem like the main things they are missing out on are the right to inherit, take a share when they're left out of a will, and meeting the requirements for coverage by a spouse's insurance. These are very important rights.
Many people don't bother to have a will, so if they live together and keep their property in just one person's name, when that person dies first the survivor loses title to his own stuff. Everything will pass to the dead person's legal heirs and there's really no way the survivor can make a claim to it. Even if he could somehow prove joint ownership he has still spent money just to retrieve his own property.
Insurance coverage is expensive and if one person stays at home, the other would have to pay for independent coverage. This issue comes down to money and proper care. At the same time, I don't think they should get joint coverage unless they are legally married. How can we expect ins. companies to just people on their word that they are "domestic partners" when people could easily team up to split coverage while sharing an apartment.
I have a relative that is gay and lived with someone for 10 years. When the relationship ended it was just like breaking up with a girlfriend: if they were splitting any property they had to figure it out on their own. If they had hated each other, then the one with title to everything could have been a real jerk about it.
People should be entitled to the same expectations in property rights as everyone else when they make a commitment and then rely on it.
One a side note: I was watching 'The Great Race' the other night and apparently two of the guys are married. One kept referring to the other as his "partner." I think they shoud be able to get married just so I don't have to hear that stupid word anymore. If he's your boyfriend, call him that. If he's your husband, call him that. Calling someone your partner just sounds, well, gay.