A list of modern day Great Ape genera (so you may understand what I'm talking about):
Homonoid - Humans
Pan - Chimpanzee
Gorilla - Gorilla
Pongo - Orang-Utan
These are our closest living cousins. Common ancestry. These are the most recent divergences. Humans still display behaviours which are exhibited by all three of these genera. Including homosexuality.
Aren't you forgetting Bonobos, which I believe are our closest cousins.
Sorry, I was just listing the main families. Bonobos are a species of Chimpanzee, their species name is Pan paniscus
, which puts them in the "Pan" genus.
Apologies for any confusion.
Now, Alma, I'm not sure exactly what you think your question implies. If I follow your logical pathway, you're saying that just because other species, including our closest cousins, exhibit homosexual behaviour this does not mean it is natural in humans. Is that what you're saying?
Anyway, back to your brilliant blindness question.
You seem to have this notion that Humans are the only animals which display homosexuality. Or are the only animals who exhibit sexual intercourse for reasons other than breeding.
To which you replied:
Nope. Not at all, nor does it change anything. Animals can be blind as well. Does that change your opinion on blindness?
No, it doesn't. You're right, animals can be blind as well as humans can. This...proves that...there's a natural explanation for blindness?
Nah you've completely lost me, sorry.