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Penile volume changes in six subjects were recorded during the presentation of various sections of erotic films and slides. It was found that films produced much greater penile volume changes in all subjects than did slides depicting the same theme. There were also clear and consistent differentiations of preference in terms of themes. For all subjects the most arousing scenes were those depicting heterosexual intercourse and the least that of a woman stripping.
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Donald A. Sandford (1974) studied this question.
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