There is a word for that: VULVA. It is a very good word. Use it more, please!
Was just in a sex shoppe looking at a product that claims it should be used on the EXTERIOR SKIN of the VAGINA.
That's like saying lipstick is for the EXTERIOR SKIN of your ESOPHAGUS, goddammit. Or, zinc oxide is for the exterior skin of your sinuses. Ooh, and a condom is for the exterior skin of your urethra. WTF stoppit!
There are a lot more parts to feminine genitalia, than the hole in the middle. Fucksakes.