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Medicine student here! Actually the thing we call “reto” in my language can be 12cm to 16cm long but after that you can actually access the rest of your “intestino delgado”, it doesn’t have any type of what I’ll call doors so it all depends on the position to be able to go deeper. The “vagina” is a LOT smaller, going to max 10cm, that’s why sex usually hurts women cause the penis will probably rip/open the “colo do útero” (which is kinda like a door)
And sorry for not searching how y’all call these words in English, google is not a trusted source

It's 3 times bigger than my arm what the actual fuck