""Sex among dwarf chimpanzees is in fact the business of the whole family, and the cute little ones often lend a helping hand when they engage in oral sex with each other."" Should we start letting our human children lend a helping hand in the bedroom? This article is very biased.
That is confusing two different issues. The thrust of the point being made is that the 'unnatural' argument won't work. The fact that there are similarities doesn't mean there are not valid differences. The puritans and religious bigots will just have to fabricate other intolerant arguments instead, I suppose.