I think it's good to let these people get a clear, concise response that is the emotional equivalent to them touching a hot stove. Protecting them from embarrassment never teaches them to stop this antisocial behavior - not just with you, but with other people. We need to make this prying just as socially taboo as casual questions about your sex life.

There are quick responses that hopefully train them - through embarrassment - not to pry, like:

• "The answer to that question is immensely painful for me. Please never bring it up again."

• "Wow. Why would you think such a private issue is your concern?"

• "That's off limits. Let's change the subject: what are you planting in the garden this year?"