Like some other words for parts of the body, this word was adopted from Latin. In addition to meaning vagina, in Latin it also refers to a sheath--a case for a knife. Probably those two things were see as similar because they are tube-shaped, and a thing (a knife in the one case and a penis in the other) can be inserted.
Note that while we sometimes use the word "vagina" to refer to the whole genital region of the female body, technically the vagina is an internal organ. The vulva is the part at the surface.
Because that's what it is in Latin, from which the English language derives many words.
yes they are called vaginas
bcos vaginas are sour
yes they are called vaginas
Only if they are female pigs, called sows.
there is one called ballsack,penises and vaginas
Yes, human females have vaginas.
likeing vaginas likeing vaginas
No. You are only a lesbian if you are sexually attracted to other vaginas.
No.
Small vaginas because that causes more friction.
Girl's Vaginas
vaginas