mulate the penis as well as the female's clitoris and vaginal wall. The stimulation triggers rhythmic, involuntary contractions in smooth muscle in the male reproductive tract, especially the vas deferens and the prostate. The contractions rapidly force sperm out of each epididymis. They also force the contents of seminal vesicles and the prostate gland into the urethra. The resulting mixture, semen, is ejaculated into the vagina.Janell L. Carroll (2018). Sexuality Now: Embracing Diversity. Cengage Learning. p. 289. ISBN 978-1337672061. සම්ප්‍රවේශය November 22, 2019. Vaginal intercourse (also referred to as sexual intercourse) involves inserting the penis into the vagina.↑ 4.0 4.1 "Sexual Intercourse". Discovery.com. August 22, 2008 දින මුල් පිටපත වෙතින් සංරක්ෂණය කරන ලදී. සම්ප්‍රවේශය January 12, 2008.↑ Rathus SA, Nevid JS, Rathus LF (2010). Human Sexuality in a World of Diversity. Allyn & Bacon. p. 251. ISBN 978-0205786060.↑ 6.0 6.1 Freberg L (2009). Discovering Biological Psych