A Secret Weapon For 性片
.. The widespread, unquestioned equation of penile–vaginal intercourse with sexual intercourse reflects a failure to examine systematically 'whether the respondent's comprehension of the query matches what the researcher experienced in your mind.' Nancy W. Denney; David Quadagno. Human Sexuality. Mosby-Year E-book. 2008: 273. ISBN 0801663741. E