Scenario: Dirty talk is hot. But sometimes you cross beyond the "Tell me you love my..." threshold and enter a weird place. You've exposed a questionable interest that spurs a quizzical look, or even demands a conversation.
Solution: As long as what you said wasn't offensive or illegal (in which case, you should stick to apologizing), you shouldn't ever feel ashamed about pushing the envelope. Half of the excitement of dirty talk is how a few filthy syllables can shake things up. But if you want to take it beyond talk, you should discuss it first. Have a conversation when you aren't having sex about what it is you want to explore. This is the best way to clue her into your kinks.