Asking someone about personal questions can make him shy. Specially when the person is sensitive and you will going to ask him about his love life for example, he might feel uncomfortable but for sure, you can see and feel it also so you might change your question into a question which you know he can answer it.
For those people in show business, it is normal for them to answer those personal questions since they were public figure and maybe owned by the public. During one of the interview of a famous hollywood celebrity, he can’t help crying. He cried because the fast cash loans that he had applied for the bank wasn’t approved. The Business Loans he was talking was the Business Loan given by the bank to those individual who wants to take up a business. I guess that was an example of personal question that not needed to be broadcast to the public.