Ubulili ububanzi bezici eziphathelene nomzimba nokuzethula komuntu ngokobufazi kanye nobudoda. Wonke umuntu ngomzimba othile onezitho ezehlukahlukene, okusetshenziswa ukuchaza ngazo izinhlobo eziningi zobulili bomzimba, okwedlula izinhlobo ezimbili esizaziyo umuntu wesifazane nowesilisa. Kukhona eziningi izinhlobo zobulili bomzimba ngenxa yesidalo somuntu kanyekanye. Ngokuya ngomongo, lokhu kungafaka izinhlaka zomphakathi ezisuselwa ocansini (okusho izindima zobulili ) kanye nobunikazi bobulili. Amasiko amaningi asebenzisa kanambambili wobulili, ukuba nobulili obubili (abafana / amadoda namantombazane / abesifazane ); labo abakhona ngaphandle kwala maqembu bangawela ngaphansi kwegama lesambulela <i id="mwLQ">elingeyona into kanambambili.</i>Eminye imiphakathi inabesilisa abathile ngaphandle "kwendoda" kanye "nowesifazane", njengama- hijra aseNingizimu Asia ; lezi zivame ukubizwa ngokuthi ubulili besithathu ( nobulili besine, njll. ).Izazi eziningi ziyavuma ukuthi ubulili yisici esiyinhloko senhlangano yezenhlalo. Isazi sezocansi uJohn Money uvame ukubhekwa njengowokuqala ukwethula ukuhlukaniswa kwamatemu phakathi kocansi lwezinto eziphilayo kanye "nendima yezobulili" (okuchazwe ekuqaleni, kufaka phakathi imiqondo yendima yezobulili nokuthi yini ezokwaziwa kamuva ngokuthi ubunikazi bobulili) ngo-1955 yize uMadison Bentley wayesevele ngo-1945 echaza ubulili ngokuthi "ukuhlukunyezwa ngokocansi", nencwadi kaSimone de Beauvoir yango-1949 ethi The Second Sex ihunyushwe njengokuqala komehluko phakathi kocansi nobulili kumcabango wabesifazane .