https://www.healthywomen.org/content/article/10-things-you-didnt-know-about-his-penis

https://www.buzzfeed.com/caseygueren/hard-facts-about-penis-size

http://mentalfloss.com/article/527234/12-facts-about-penis

https://www.nhs.uk/live-well/sexual-health/five-penis-facts/

https://www.buzznick.com/penis-facts/

https://spafe.com.au/penis-facts/

https://youtu.be/swIHaQ1dscc