peeople

When driving in town the girl asks the boy.  But the jargon might be different between the girl and the boy.  A shy  girl might say, "We should buy gasoline."  The boy may not understand the girl wants to use the gasstation's rest room.  The boy will likely be embarrassed when he realizes he didn't catch the meaning.

But when approaching a long stretch of country road with no rest stops or a long bus ride with no toilet on the bus.  The boy says something like, "After this next place, there's no rest stop for 45 minutes."

If the girl feels more comfortable with a direct word (pee, tinkle, urinate, etc) she should use it so the boy knows what direct word she accepts.

Is there an implied question?  Obviously, most men who participate here prefer a women with a small bladder.