I know of a method in which you give each respondent a coin and ask them to flip it in secret. If the coin lands heads, answer "Yes," if not, answer honestly. Then, if you ask a question like "Have you sexted?" or "Do you use drugs?", you may get survey results that look like 60% yes and 40% no. You subtract 50% from the yes count to account for the coin toss and get accurate overall results, but the participants have plausible deniability.
However, I can't remember the name of it, nor the article I read about it, and Google isn't helping.
However, I can't remember the name of it, nor the article I read about it, and Google isn't helping.