"The vagina is what we learned about in sex ed, because of its role in reproduction," said Kate Sloan, a sex educator in Toronto and author of "200 Words to Help You Talk About Sexuality & Gender."
But that focus on the vagina has largely simplified female reproductive anatomy. The use of "vagina" when someone means "vulva" is pervasive. This is nothing new.
Consider the fact that the pinnacle reference book for parts of the human, Gray's Anatomy, removed "clitoris" from the 1948 edition.
"And the clitoris is a part of the human body with thousands of important nerve endings," Barrica noted.
Going back much further, there wasn't even an English word for "vagina" until around the 1680s. The Latin word "vagina" originally meant "sheath" or "covering."
Mystery continues to shroud female anatomy. The regular misuse of the word vagina as vulva is a big part of that mystery.
"That's like someone referring to the penis but only mentioning the balls," Sloan said.
When we properly identify the vulva—and not just the vagina—we're including the clitoris and labia, without minimizing women's genitalia to the part that can be penetrated by a penis.
Today, most anatomical illustrations of the female body label the vulva and vagina correctly and include the clitoris. But they're still persistently incomplete, including only the smallest part of the clitoris, protruding in the corner of the labia, and leaving out the hood and the legs that extend inside the vagina.
Jimanekia Eborn, a comprehensive sex expert and trauma survivor in Los Angeles, said this misuse of vagina and vulva is one of the most common misunderstandings or gaps in knowledge she encounters in her practice. The way we use, or misuse, language can have an impact on our experience with sex.
"Most of us were never taught about our own genitals, which starts us off not being able to even address our body parts or ask for certain things," Eborn said. "We don't even know what we're asking for!"