In a horse, the vulva consists of the labia, with
occasional glances of the opening (vestibule) and
clitoris if in the midst of a vulvar
wink.

In a human, the vulva includes the opening of the vagina, the labia
majora (outer lips), the labia minora (inner lips), and clitoris.

The vulva is primarily external and typically visible.

If the interior is also visible or is the primary focus, then you should
tag vagina instead.

Example:

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Image tags: explicit, artist:tresmariasarts, artist:tresmariasnsfw, derpibooru import, twilight sparkle, pony, unicorn, anus, female, nudity, on back, ponut, solo, solo female, unicorn twilight, vulva