Articles lacking reliable references from November 2006 Create Talk0 Category page This page needs content. You can help by adding a sentence or a photo! Add to this page! Human females “The penile plethysmograph (PPG) is a controversial type of plethysmograph that measures changes... Penile plethysmograph Pages in category "Articles lacking reliable references from November 2006" The following 2 pages are in this category, out of 2 total. H Human femalesP Penile plethysmograph Retrieved from "http://psychology.wikia.com/wiki/Category:Articles_lacking_reliable_references_from_November_2006"