Online Etymology Dictionary
https://www.etymonline.com word vagina
Vagina - Etymology, Origin & Meaning - Etymonline
"sexual passage of the female from the vulva to the uterus," 1680s, medical Latin, from specialized use of Latin vagina "sheath, scabbard, covering; sheath of an ear of grain, hull, husk" (plural vaginae), a word of uncertain origin.
Wikipedia
https://en.wikipedia.org wiki Vagina
Vagina - Wikipedia
The term vagina is from Latin vāgīna, meaning "sheath" or "scabbard". [1] The vagina may also be referred to as the birth canal in the context of pregnancy and childbirth. [2] [3] Although by its dictionary and anatomical definitions, the term vagina refers exclusively to the specific internal structure, it is colloquially used to refer to the vulva or to both the vagina and vulva.
When it is closed ("encloses" ) it protects the internal organs.
That it does not mention other functions and uses does not mean it is wrong or stupid. If you want to get a reference to other uses, ask a more appropriate prompt.
There is much stupidity in composing a dead-simple prompt and expecting it to do more than what was asked. Neither human experts nor AI programs are mind readers.
If you want porn, ask for porn. If you want etymology, ask for etymology.