▁co cks ▁specifically ▁out ▁of ▁a ▁desire ▁for ▁an onym ity . ▁ ▁Work ▁on ▁a ▁por n ographic ▁film ▁can ▁be ▁very ▁demand ing , ▁and ▁it ▁is ▁often ▁difficult ▁for ▁actors ▁to ▁perform ▁on ▁demand ▁as ▁needed . ▁A ▁common ▁function ▁of ▁a ▁st unt ▁co ck ▁is ▁to ▁stand ▁in ▁for ▁an ▁actor ▁who ▁is ▁unable ▁to ▁achieve ▁ere ction ▁or ▁ej ac ulation ▁on ▁an ▁actor ▁who ▁has ▁a ▁pen is ▁of ▁a ▁relatively ▁similar ▁size , ▁so ▁that ▁film ing ▁can ▁continue ▁on ▁schedule . ▁ ▁In ▁popular ▁culture ▁ ▁In ▁the ▁ 1 9 7 6 ▁film ▁The ▁First ▁N ud ie ▁Musical , ▁the ▁character ▁Ros ie ▁( play ed ▁by ▁C ind y ▁Williams ▁of ▁La ver ne ▁& ▁Sh ir ley ▁fame ) ▁announ ces ▁the ▁arrival ▁of ▁a ▁" st unt ▁co ck " ▁to ▁complete ▁the ▁film ing ▁of ▁a ▁key ▁por n ▁scene . ▁▁ ▁In ▁the ▁ 1 9 9 7 ▁Tre y ▁Parker ▁film ▁Or g az mo , ▁the ▁protagon ist ' s ▁director ▁assign s ▁him ▁a ▁st unt ▁co ck , ▁as ▁he ▁does ▁not ▁want ▁to ▁particip ate ▁in ▁the ▁sexual ▁scenes ▁due ▁to ▁his ▁M orm on ▁affili ation . ▁▁ ▁In ▁the ▁sixth ▁book ▁of ▁The ▁Dresden ▁Files , ▁Blood ▁R ites , ▁Harry ▁investig ates ▁a ▁por n ographic ▁film ▁crew ▁and ▁is ▁mistaken ▁for ▁a ▁st unt ▁co ck ▁by ▁one ▁of ▁the ▁actors . ▁ ▁A ▁st unt ▁co ck