Data used as input for the Pendex Calculator is collected from:
- https://en.wikipedia.org/wiki/Human_penis_size
- https://www.medicalnewstoday.com/articles/271647.php
- https://www.nhs.uk/live-well/sexual-health/penis-size/#average-penis-size
- https://www.worlddata.info/average-penissize.php
- http://wwwu.edu.uni-klu.ac.at/amiklaut/dr_nick/answer19.htm
- https://worldpenis.tadaa-data.de/
- https://www.worlddata.info/average-bodyheight.php
- https://en.wikipedia.org/wiki/List_of_average_human_height_worldwide
- https://ourworldindata.org/human-height