"What is the perfect vagina? "
This is a philosphical question, and since all of Western philosophy consists of a series of footnotes to Plato, according to Alfred North Whitehead, it is to Plato we must turn.
According to Plato's Theory of Forms (or Theory of Ideas), the perfect anything, whether vagina, soul, table, weed-whacker, etc., exists as an abstraction in its own metaphysical realm.
All the vaginas here in the material world that have ever existed, or ever will exist, are more or less approximations or copies of the Ideal Vagina.
So, is it possible for us to have knowledge of such Ideal forms? Can the intellect truly grasp the noumena behind the phenomena that is know as "Vagina"?
Maybe, if the Sage of Konigsberg is to be believed. I refer to the philosopher Immanuel Kant, whose last name, if given the proper German pronunciation, happens to sound very much like an English slang word for "vagina". Coincidence? I think not!