1"Bent Penis." Mayo Clinic. Accessed: May 30, 2018.
2Brame, Gloria. "Why Small is Better: The 4-Inch Advantage for Men." HuffPost. April 25, 2017. Accessed: May 31, 2018.
3"Erectile Dysfunction." Mayo Clinic. Accessed: May 31, 2018.
4Fisch, Harry. The Male Biological Clock. New York: Free Press, 2005.
5Harris, Nadia-Elysse. "Average American Man’s Penis Is 5.6 Inches Long; Research Indicates Mode of Inducing Arousal Could Influence Size." Medical Daily. July 18, 2013. Accessed: May 30, 2018.
6"Japan’s Annual Penis Festival Is as Phallic as You’d Expect (PHOTOS)." HuffPost. April 7, 2014. Accessed: May 31, 2018.
7Kaplan, Helen Singer, and Melvin Horwith. The Evaluation of Sexual Disorders: Psychological and Medical Aspects. Levittown, PA: Helen Singer, 1983.
8Kurson, Robert. "Mr. Big: Jonah Falcon's Giant Penis Problem." Rolling Stone, June 12, 2003. Accessed: May 31, 2018.
9Lehnardt, Karin. "83 Amazing Facts about Spiders." FactRetriever.com. August 21, 2016. Accessed: May 31, 2018.
10"Phallophobia." Macmillan Dictionary. Accessed: May 30, 2018.
11"Priapism." Mayo Clinic. Accessed: May 31, 2018 .
12Roberts, Holly. "Erections in Babies." Livestrong. June 13, 2017. Accessed: May 30, 2018.
13Rosenberg, Robert. "Sexual Dysfunction in Men." Everyday Health. Accessed: May 30, 2018.
14Schwartz, Evan Scott. "The 8 Different Types of Boners Men Get." Women's Health, May 1, 2015. Accessed: May 30, 2018.
15Sgobba, Christa. "What REALLY Happens When You Fracture Your Penis." Men's Health, October 14, 2015. Accessed: May 31, 2018.
16Spitz, Aaron. The Penis Book: A Doctor's Complete Guide to the Penis. Emmaus, PA: Rodale, 2018.
17Tukcer, Nikki. "Koro Syndrome: The Genital Retraction Fear." Medical Daily. September 21, 2012. Accessed: May 31, 2018.