(原始内容存档于2016-05-22). — A biographical collection of data fora sociological repository on the topic of mutual masturbating to study changes on the activity
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(页面存档备份,存于互联网档案馆), by Richard Hofstadter Richard Hofstadter. America at 1750: A Social Portrait. Knopf Doubleday. 1971: 36 [2014-12-27]. (原始内容存档于2020-07-15). William