▁alone , ▁s per mic ides ▁have ▁a ▁perfect ▁use ▁failure ▁rate ▁of ▁ 6 % ▁per ▁year ▁when ▁used ▁correctly ▁and ▁consist ently , ▁and ▁ 2 8 % ▁failure ▁rate ▁per ▁year ▁in ▁typical ▁use . ▁ ▁S per mic ide ▁br ands ▁ ▁This ▁list ▁of ▁examples ▁was ▁provided ▁by ▁the ▁May o ▁C lin ic ▁▁ ▁V CF ▁V ag inal ▁Cont ra cept ive ▁Film ▁V CF ▁V ag inal ▁Cont ra cept ive ▁Gel ▁V CF ▁Cont ra cept ive ▁Fo am ▁Con cept rol ▁Cr in one ▁Enc are ▁End omet rin ▁First - Pro g ester one ▁V GS ▁G yn ol ▁II ▁Pro ch ieve ▁Today ▁S pon ge ▁V agi - G ard ▁Dou che ▁Non - St aining ▁ ▁Non ox yn ol - 9 ▁is ▁the ▁primary ▁chemical ▁in ▁s per mic ides ▁to ▁in hib it ▁s perm ▁mot ility . ▁Active ▁secondary ▁s per mic idal ▁ing red ients ▁can ▁include ▁oct ox yn ol - 9 , ▁ben z alk on ium ▁ch lor ide ▁and ▁men f eg ol . ▁These ▁secondary ▁ing red ients ▁aren ' t ▁main stream ▁in ▁the ▁United ▁States , ▁being ▁the ▁only ▁active ▁ing red ient ▁adopted ▁the ▁one ▁c ited ▁above . ▁ ▁Pre vent ing ▁s perm ▁mot ility ▁will ▁in hib it ▁the ▁s perm ▁from ▁trav elling ▁towards ▁the ▁egg ▁moving ▁down ▁the ▁fal lop ian ▁tub es ▁to ▁the ▁u ter us . ▁ ▁In ▁fact