I'm afraid it's not clear from the question what interview you're referring to. Please see this Guide: http://www.avvo.com/legal-guides/ugc/five-tips-for-how-to-ask-for-legal-advice-on-avvocom
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Interview is a way to find out the truth about the bona fide of the marriage. IF you marriage is bona fide you should have nothing to be afraid of, including the sex questions.
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Assuming you're talking about a marriage case, I suppose it's possible, though unlikely. They are just trying to ascertain whether it's a legitimate (bona fide) marriage. It's possible that could involve sex-related questions, though probably not assuming you can prove the relationship is legitimate in a number of other ways.
This is not legal advice and no attorney-client relationship has been formed, now or in the future. This is just a casual opinion expressed about a hypothetical situation.