Regardless of whether you accept evolution or not that video does nicely make the point that we don't do things or accept things just because other species do. Therefore whether homosexuality is natural or not is irrelevant in this context.
I don't think anyone would contest the premise that homosexuals exist (or if they did, then they have nothing to support or object to).
The only question is how to handle it as a society. Someone who objected should therefore be looking for evidence that homosexuals harm people not involved in the relationship, or that it does some harm to society as a whole.
But although supporters can try to refute their arguments it’s really not something you could argue the positives of. It’s like building a sandcastle on a beach. Society allows you to do it because although it doesn’t really accomplish anything or provide any benefit to anyone other than those involved there’s really no reason to forbid it. In fact to do so would be considered quite oppressive.
This is the problem with asking for articles that support homosexuality. No matter the topic, people should be allowed to choose their actions for themselves, up to the point where they’re harming others. Any argument has to start with a reason to forbid an action, rather than a reason to permit it.
