I don't know, nor really care. I just don't like the way you instantly assume Collins couldn't have been attracted to his crewmates.
He may have been, he may not have been, but either way, you are making an assumption and promoting it as fact.*As nicely as possible*
If you are homosexual, you are omosexual. If you are heterosexual, you are heterosexual. Its just the way you are, same as being dark skined, blue eyed, or red haired.
It doesn't matter if you KNOW what you are, you still ARE... for example, in the history of the world, most people didn't KNOW they had a pancreas, or what it was for, but they still had one.
So yes, Adam and/or Eve could have been homosexual, without ever knowing it.
Indeed, if you believe in a literal Adam and Eve, then its looking pretty good that one of them at least must have, at the very least, been a carrier of the genes that give one homosexual tendencies... otherwise where'd the gene come from?