xual intercourse – more specifically, penile–vaginal intercourse. [...] The widespread, unquestioned equation of penile–vaginal intercourse with sex reflects a failure to examine systematically 'whether the respondent's understanding of the question matches what the researcher had in mind.' {{cite book}}: Check |url= value (help)Fedwa Malti-Douglas (2007). Encyclopedia of Sex and Gender: A-C. Macmillan Reference. p. 308. ISBN 978-0028659619. Sexual intercourse. [T]he term coitus indicates a specific act of sexual intercourse that also is known as coition or copulation. This 'coming together' is generally understood in heteronormative terms as the penetration of a woman's vagina by a man's penis.Irving B. Weiner; W. Edward Craighead (2010). [11"1111"https://books.google.com/books?id=pUSG1BONmekC&pg=PA1577 The Corsini Encyclopedia of Psychology]. Vol. 4. John Wiley & Sons. p. 1577. ISBN 978-0470170236. සම්ප්‍රවේශය August 21, 2013. Human sexual intercourse, or coitus, is one of the most