Health·Posted on Jun 3, 2016This Might Be The Hardest Penis Quiz EverCan you prove you're a penis genius?by Caroline Kee BuzzFeed StaffLinkFacebookPinterestTwitterMail Anatomical information sourced by: * The Mayo Clinic* National Institute of Health (NIH) Medline Plus* The NIH National Center for Biotechnology Information, National Library of Medicine PubMed Health Database* The Pub Med Health Male Anatomy Glossary* The Encyclopedia Britannica