▁the ▁deep ▁proper ▁insert ion ▁of ▁s per mic ide ▁should ▁effectively ▁block ▁the ▁cer v ix ▁so ▁that ▁s perm ▁cannot ▁make ▁it ▁past ▁the ▁cer v ix , ▁to ▁the ▁u ter us , ▁or ▁the ▁fal lop ian ▁tub es . ▁ ▁Sch ol ars ▁K . T . ▁Bart man ▁and ▁et ▁al . ▁study ▁obser ving ▁the ▁distribution ▁of ▁s per mic ide ▁containing ▁Non ox yn ol - 9 ▁in ▁the ▁v ag inal ▁tract , ▁showed ▁“ After ▁ 1 0 ▁min ▁the ▁gel ▁spread ▁within ▁the ▁v ag inal ▁canal ▁providing ▁a ▁cont igu ous ▁covering ▁of ▁the ▁ep ith el ium ▁of ▁variable ▁thick ness .” ▁The ▁sole ▁goal ▁of ▁s per mic ide ▁is ▁to ▁prevent ▁fert il ization . ▁ ▁Men f eg ol ▁is ▁a ▁s per mic ide ▁manufact ured ▁as ▁a ▁fo aming ▁table t . ▁It ▁is ▁available ▁only ▁in ▁Europe . ▁ ▁Oct ox yn ol - 9 ▁was ▁previously ▁a ▁common ▁s per mic ide , ▁but ▁was ▁removed ▁from ▁the ▁U . S . ▁market ▁in ▁ 2 0 0 2 ▁after ▁manufact ur ers ▁failed ▁to ▁perform ▁new ▁studies ▁required ▁by ▁the ▁F DA . ▁ ▁The ▁s per mic ides ▁ben z alk on ium ▁ch lor ide ▁and ▁sod ium ▁ch olate ▁are ▁used ▁in ▁some ▁contra cept ive ▁sp ong es . ▁ ▁Ben z alk on ium ▁ch lor ide ▁might ▁also ▁be ▁available ▁in ▁Canada ▁as ▁a ▁supp os