With sufficient attention to establishing rapport and securing anonymity the results of questionnaire studies may be as dependable as interview methods of determining sex practices and beliefs. The returns of 111 of 138 advanced psychology students gave results closely similar to the best interview results. Beliefs about sex practices in the general population were related to own sex practices, suggesting the operation of projection mechanisms. (PsycINFO Database Record (c) 2006 APA, all rights reserved)
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Frank W. Finger (1947) studied this question.