▁ej ac ulated ▁sem en ▁during ▁sexual ▁inter course ▁with ▁a ▁woman , ▁the ▁woman ▁would ▁also ▁become ▁rit ually ▁imp ure , ▁until ▁the ▁evening ▁had ▁come ▁and ▁she ▁had ▁was hed ▁herself ▁in ▁water . ▁ ▁The ▁Book ▁of ▁De uter onomy ▁says ▁that ▁a ▁soldier ▁who ▁became ▁imp ure ▁through ▁a ▁m ik reh ▁la il ah ▁(" night ▁occurrence ") ▁must ▁leave ▁the ▁army ▁camp , ▁immer se , ▁and ▁only ▁return ▁to ▁the ▁camp ▁in ▁the ▁evening . ▁From ▁the ▁word ▁m ik reh ▁( מ ק ר ה ), ▁the ▁rabb is ▁derived ▁the ▁term ▁ker i ▁( ק ר י ) ▁to ▁refer ▁to ▁an ▁emission ▁of ▁sem en . ▁ ▁Non - trad itional ▁bib lic al ▁sch ol ars ▁see ▁the ▁Lev it icus ▁reg ulations ▁as ▁having ▁originally ▁derived ▁from ▁tab oo ▁against ▁contact ▁with ▁sem en , ▁because ▁it ▁was ▁considered ▁to ▁house ▁life ▁itself , ▁and ▁was ▁thus ▁thought ▁of ▁as ▁sacred .< ref > Pe ake ' s ▁comment ary ▁on ▁the ▁Bible </ ref > ▁ ▁In ▁rabb in ic ▁literature ▁ ▁The ▁Tal m ud ▁adds ▁prohib itions ▁designed ▁to ▁avoid ▁sem inal ▁emission ▁outside ▁of ▁sexual ▁inter course . ▁It ▁was ▁forb idden ▁for ▁a ▁man ▁to ▁touch ▁his ▁pen is ▁with ▁his ▁hand , ▁on ▁the ▁basis ▁that ▁the ▁sens ation ▁of ▁touch ▁causes ▁ker i . ▁The ▁Tal m ud ▁goes ▁on ▁to ▁address ▁the ▁concern ▁that ▁prevent ing ▁any ▁contact ▁with ▁the ▁pen is