Thereasonsforsuchchangesarecomplex.Someproponentsofequalityforsexualminoritiescontestthatitisevennecessarytoexplainandjustifythedevelopments.Theyassertthat,inprinciple,itisnobusinessoftheStateorthecommunitytodiscriminateamongstcitizensinbasiccivilrightsonthefootingofwhatthosecitizensdosexuallyintheirrelationswithotheradultsorinthebondsthattheyformwithotherhumanbeings.Forthem,theseareprivatematters.Theorganisedcommunityhasnorighttointerfere.Ithasadutytotreatallpersonswithequalitybecausethatisafeatureinherentinthehumandignityofallofus.
Giventhatinmany(perhapsmost)countriesoftheworldlaws,religion,socialstigmaandotherimpedimentsstillexisttotrueopennessaboutsexualorientation,outsidethemajoritynorm,thewidespreadchangesthathaveoccurredinthepastfewdecadesareremarkable.Itisworthcollectingsomeofthecauses.Theyinclude:
(1)Theadvanceofunderstandingofhumanpsychologyandtheresearchperformedduringthetwentiethcenturyintofeaturesofsexualattraction.ThewritingsofSigmundFreud,AlfredKinsey,EvelynHookerandothershelpedtodemonstrate,empirically,thevarietyofsexualexpressionamongsthumanbeingsandtheimperfectionsofthestrictbinaryassumptionuponwhichearliermoralattitudes,inpartatleast,hadrested;