I'm also now scared that you get offended while I really don't want you to; that's not why I asked. I might be missing some connotations, or the specific tone that goes with that phrase.
See http://www.microsoft.com/business/en-us/resources/management... and http://www.focus.com/fyi/30-interview-questions-you-cant-ask... for some lists of questions that help illustrate this. Instead of asking a very personal question like "Do you have or plan to have children?" and extrapolating random stuff from the answer, you ask the directly useful question you really meant to ask: "Are you available to work overtime on occasion? Can you travel?"