Njengokuqinisekiswa "kobuzalwane" bomtsalane wobufanasini, abagqugquzeli be-LGBT bahlala bebhekisa kubo kufunda Isazi ngemithambo-luvo uSimon LeVay osuka kwi-1991, apho wafumanisa ukuba i-hypothalamus yamadoda “athandana nesini esifanayo” ilingana naleyo yabasetyhini, ekucingelwa ukuba ibenza amafanasini. Yintoni ngokwenene eyafunyanwa nguLeVay? Into angazange ayifumane ngokuqinisekileyo yayilunxibelelwano phakathi kwesakhiwo sobuchopho kunye neendlela zokuziphatha ngokwesondo. 

Uninzi lwezixhobo ezingezantsi zipapashwa kwingxelo yohlalutyo. "Iintsomi ezenziwa ngabantu abathandana abathandanayo kwaye zibhengeza ukukhanya kwesayensi". ikhonkco:10.12731/978-5-907208-04-9, ISBN 978-5-907208-04-9

Esinye seziqubulo zentshukumo "ye-LGBT" sisibakala sokuba umyinge wabantu abanomtsalane kubufanasini ekucingelwa ukuba yi-10% -oko kukuthi, lonke ishumi. Ngokwenyani, ngokwezifundo ezikhulu zale mihla ezenziwa eUnited States kunye namazwe e-European Union (Oko kukuthi, kumazwe apho ubufanasini bunenkxaso ebanzi kunye nokukhuselwa kwizixhobo zikarhulumente), inani labantu abazichaza njengamafanasini liyahluka ukusuka kwi-1% ukuya kuma-3 ubuninzi. %.