John Paul Jones writing the poem in Latin while at sea is significant because 98% of the time, the people on a ship are uneducated. No man in their right mind really wants to sail (notice I say man. Many boys would take to the seas when they’re 13 or younger as apprentices and cabin boys because they still romanticize it and have not yet realized the horrors of a life at sea). Most people become sailors because it’s the only option left to them, because they’re greedy enough to risk their lives for cash, or they have ambition. So, in most cases, the only man on the ship who is educated is the captain (and often their education is limited as well). The rest of the men on the ship have basic learning at best and they most definitely never learned classic languages like Latin or Greek. So, Jones wrote a bisexual poem in Latin that no one else on his ship could read and, if discovered, would only be gibberish to whoever found it.