422–423. ISBN 978-0495553397. සම්ප්‍රවේශය January 5, 2012. The man-above, or "missionary," position is the most common [sex position].↑ Sexual intercourse most commonly means penile–vaginal penetration for sexual pleasure and/or sexual reproduction; dictionary sources state that it especially means this, and scholarly sources over the years agree. See, for example;"Sexual intercourse". Sexual intercourse. https://www.dictionary.com/browse/sexual-intercourse. ප්‍රතිෂ්ඨාපනය November 22, 2019. "Sexual intercourse". Sexual intercourse. http://www.merriam-webster.com/dictionary/sexual%20intercourse. ප්‍රතිෂ්ඨාපනය December 5, 2014. "Sexual intercourse". Macmillandictionary.com. සම්ප්‍රවේශය May 9, 2019.Richard M. Lerner; Laurence Steinberg (2004). [11111111https://books.google.com/books?id=_wXasY1HyAYC&pg=PA193 Handbook of Adolescent Psychology]. John Wiley & Sons. pp. 193–196. ISBN 978-0471690443. සම්ප්‍රවේශය April 29, 2013. When researchers use the term sex, they nearly always mean se