The interesting question is, given that homosexuality doesn’t result in offspring, why has it survived, genetically?
My husband’s family are farmers (cattle and sheep primarily), and he has pointed out to me that homosexual behavior is quite common among the animal kingdom. He also said he doesn’t believe that the animals that exhibited homosexual behavior helped to raise any other’s offspring, so I’m not too sure about that hypothesis.

Also, the research regarding whether the homosexual brain is different from the heterosexual brain is still in the early stages, and at this point there is not enough evidence to say conclusively that they are physically different.

A personal hypothesis of mine (which I will make clear is not based on any research, I merely think it could be an interesting point), is that homosexuality could be nature’s population control. In the animal kingdom, an excessively large population of species in a certain habitat can be harmful to that species (limited resources, etc.), and it could be that having a few homosexual individuals within the population that do not have offspring is a way to stem the population tide, so to speak.

My views: Yes to civil unions
Yes to adoption by a LGBT couple or individual
Yes to stem cell research