<□>Inmanyc□lture□andso□ieties,□ncestiscons□dere□ta□oo□ndisstri□t□y□orbidden.Theide□ofrom□nticorse□ualrel□tionshipsb□tweensib□in□sismetwithsh□ck,disg□st,and□ora□ou□rage.The□ab Inm□nycu□ture□andsocieti□s,inces□isconsideredtab□oandi□stric□lyforbidden.Theide□o□romantic□rsexualrelati□nshi□sbetw□ensi□lingsismetwi□hsho□k,disgust,□nd□ora□outra□e.Thetab Inman□cul□u□esa□dsocietie□□incestisc□n□i□eredtab□oand□s□trictlyfor□□dden.The□dea□f□omantic□rsexualre□□□ionshipsbetwee□□iblingsismetwith□hock□dis□ust,andmoralo□□□age.Thetab□>