A good way to look about vulva identification is that a form will either be an animal vulva, a humanoid vulva, or unusual vulva. The latter category might overlap with the other categories.

Animal anatomy

• The anatomy should not match the criteria for a cloaca, or genital slit.
• Be suspicious of orifices that look like flat slits on non-mammal species.
• If the anatomy is consistent with another species, use the animal vulva tag for that species instead. Certain species have vulva with humanoid traits.
• A vulva that appears like a coin-slot is more likely (but not always) to be an animal vulva, than a humanoid one.

Defining traits

• Obviously if the body is that of a human, or humanoid, the genitalia (not always) is likely to be humanoid as well.
• Look for a visible humanoid labia majora (outer labia), or labia minora (inner labia). The labia minora doesn't need to be visible. See innie_vulva
• Without reason to conclude otherwise, the base assertion is that humanoid labia belongs to a humanoid vulva, especially if it has a plump appearance.
• Cloaca and genital slits sometimes appear plump, but should not be tagged as plump_labia.
• Do not expect the anatomy to look completely accurate. Artistic liberty can change the form in a way that differs from what the anatomy should look like, and that is fine.

Vulva anatomy

• clitoral_hood
• clitoris
• labia majora/minora
• urethra (inside)

General appearance

• innie vulva - This concept is usually humanoid, with very rare exceptions.
• long labia
• plump labia

The appearance of a pubic mound is also highly associative with a character that has a humanoid vulva.