Theseus, here is a children's poem by Zacharias Papantoniou, which I remember from primary school, and which might clarify your confusion about grapes. There is no double entendre here, unless you have a very vivid imagination:
Σε μια ρώγα από σταφύλι
έπεσαν οχτώ σπουργίτες
και τρωγόπιναν οι...