Because naughty questions would either embarass her, or she will not want to answer or both, and the answers will amuse us, but i'd prefer to try and appreciate someone for their mind. I'm not tempted to ask Peter naughty questions(as hot as he is, but I am tempted to ask Quirky naughty questions. So naughty answers are just gratuitous fan service. Despite that, the deliciousness that is naughty answers still makes the concept very tempting.