"The most significant contribution the comic made to popular culture has been the popularization of the onomatopoeia “fap” for the sound of male masturbation. While Clay did not invent it (the source is VIZ Media’s translation of Heartbroken Angels), his use of “fap” has led it to become an almost universal term online. The term was first used in his third comic produced in April 28, 1999 and appears to be the first appearance of the term on the Internet.[12][original research?] In a similar vein, Clay used the onomatopoeia “schlick” for the sound of female masturbation."