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Not sure about the last bit as seems a bit contradictory, but as far as sexual arousal coming from the body and the implication that homosexuality (and by extension, all other sexual attractions) are there for natural and not of issue seems to fall apart when applied to necrophilia, pedophilia, BSDM, bestiality, and an entire range of other related sexual issues.
Additionally, the argument from nature is difficult to get behind as well (especially from a christian perpective, such as mine, admittedly - as we are supposed to be in the world, but not of the world) as mankind as historically made a point of emphasizing how separate, distinct, and above/beyond the animal world we are; man is civilized, able to reason and think, and as such should not give into such animalistic behaviours (historical excuses for us considering ourselves superior to animals, etc. - most of which completely fall apart with sincere appraisal of a whole range of human activities...), so appealing to occurrences of homosexual behavior in the animal kingdom also doesn't do much to help here
However, I must agree with your main thrust here - in short, and I know we'll effectively never get there on the whole, sadly - we might never know, and as long as it doesn't impact you directly there's not really any reason to get wound up about it one way or the other as we ARE NOT to be the judges of all those around us - and I *can* argue that from a biblical basis if any believers choose to take issue with this.