Editing Missionary position (section)

===Basic position===
In the missionary position, a woman lies on her back on a bed or other surface with her legs comfortably spread with the soles of the feet resting. The penetrating partner positions himself between the woman's spread legs, and either uses his arms to hold himself up, or lets his weight rest on her. When the woman's vagina is sufficiently lubricated, which may involve [[Fingering (sexual act)|fingering]] her [[Human vulva|vulva]] or [[clitoris]] in particular, the man will introduce his erect penis in her vagina for [[sexual penetration|penetration]], and may use fingers to open the woman's labia and guide the penis in.

With the penis inside the woman's vagina, the man can control the force, depth, and rhythm of [[Pelvic thrust|thrusts]], and can also control to some extent the female partner's movements. Subject to the man's weight and position, the woman may have some control by pushing her feet and legs against the mattress and by side movements in her pelvis as well as by clutching onto and moving with her partner.<ref name="Kar">{{cite book |first1=Nilamadhab |last1=Kar |first2=Gopal Chandra |last2=Kar |title=Comprehensive Textbook of Sexual Medicine |publisher= [[Jaypee Brothers|Jaypee Brothers Publishers]] |pages=107–108 |isbn=978-8180614057 |year=2005 |access-date=February 10, 2014 |url=https://books.google.com/books?id=YxcjMPbGHQIC&pg=PA107 }}{{Dead link|date=August 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>  A woman can increase the force of a man's thrust by moving against the man's rhythm.

The man may straddle the woman, taking the woman's legs between his. This restricts and further controls the woman's movements, and the man can increase the tightness on the penis by pressing the woman's thighs together. However, this increases vaginal friction and makes thrusting more difficult.

During sexual intercourse, most women experience involuntary [[vaginal contraction]]s.<ref>{{cite journal |pmid=8174183 |year=1994 |last1=Kratochvíl |first1=S |title=Vaginal contractions in female orgasm |volume=90 |issue=1 |pages=28–33 |journal=Ceskoslovenska Psychiatrie}}</ref> The contraction causes the [[pelvic muscles]] to tighten around the penis, which increases the level of her partner's arousal and sexual frenzy and results in the man increasing the pace and force of thrusts as he approaches orgasm, which in turn further increases the woman's vaginal contraction. After a man has achieved orgasm, he will normally collapse onto the woman and will normally not be capable of further thrusting. Some men try to control their [[orgasm]] until their female partner also orgasms, but this is not always achieved. At times, a woman can achieve orgasm after the man has ceased thrusting by contracting her vaginal muscles and with pelvic movements, or the couple may change to another position that enables the woman to continue thrusting until she has reached orgasm, such as a [[woman on top]] position.

During sexual intercourse in the missionary position, the penis is in preferential contact with the [[Anterior#Superior and inferior|anterior]] wall of the vagina and the tip of the penis reaches the [[Fornix of the vagina|anterior fornix]], while in the rear-entry position it is in preferential contact with the posterior wall of the vagina and probably reaches the posterior fornix.<ref>{{cite journal|title=Magnetic Resonance Imaging (MRI) of Sexual Intercourse: Second Experience in Missionary Position and Initial Experience in Posterior Position |journal=Journal of Sex & Marital Therapy |volume=28 |pages=63–76 |year=2002 |doi=10.1080/00926230252851203 |pmid=11898711 |author1=A. Faix |author2=J. F. Lapray |author3=O. Callede |author4=A. Maubon |author5=K. Lanfrey |url=http://www-psych.stanford.edu/~knutson/ans/faix02.pdf |url-status=dead |archive-url=https://web.archive.org/web/20120905011902/http://www-psych.stanford.edu/~knutson/ans/faix02.pdf |archive-date=2012-09-05 |citeseerx=10.1.1.496.11 |s2cid=16407035 }}</ref>