itory . ▁ ▁The ▁ 2 0 0 8 ▁Ig ▁Nobel ▁Prize ▁( a ▁par ody ▁of ▁the ▁Nobel ▁P riz es ) ▁in ▁Chem istry ▁was ▁awarded ▁to ▁Sh eree ▁U mp ierre , ▁Joseph ▁Hill , ▁and ▁Deb or ah ▁Anderson , ▁for ▁discover ing ▁that ▁C oca - Col a ▁is ▁an ▁effective ▁s per mic ide , ▁and ▁to ▁C . Y . ▁Hong , ▁C . C . ▁Sh ie h , ▁P . ▁Wu , ▁and ▁B . N . ▁Chi ang ▁for ▁prov ing ▁it ▁is ▁not . ▁ ▁Lem on ▁ju ice ▁solutions ▁have ▁been ▁shown ▁to ▁imm obil ize ▁s perm ▁in ▁the ▁labor atory , ▁as ▁has ▁K rest ▁B itter ▁Lem on ▁drink . ▁While ▁the ▁authors ▁of ▁the ▁K rest ▁B itter ▁Lem on ▁study ▁suggested ▁its ▁use ▁as ▁a ▁post co ital ▁dou che , ▁this ▁is ▁unlikely ▁to ▁be ▁effective , ▁as ▁s perm ▁begin ▁leaving ▁the ▁ej ac ulate ▁( out ▁of ▁the ▁reach ▁of ▁any ▁dou che ) ▁within ▁ 1 . 5 ▁minutes ▁of ▁de position . ▁ ▁No ▁published ▁studies ▁appear ▁to ▁have ▁been ▁done ▁on ▁the ▁effect iveness ▁of ▁le mon ▁ju ice ▁prepar ations ▁in ▁prevent ing ▁pre gn ancy , ▁though ▁they ▁are ▁advoc ated ▁by ▁some ▁as ▁' natural ' ▁s per mic ides . ▁ ▁L actic ▁acid ▁prepar ations ▁have ▁also ▁been ▁shown ▁to ▁have ▁some ▁s per mic idal ▁effect , ▁and ▁commercial ▁la ctic ▁acid - based