"The Architecture of Racial Segregation: The Challenges of Preserving a Problematic Past"- Robert R. Weyeneth from The Public Historian vol. 27 no. 4 p. 11-44 (Fall 2005)

It discusses the forms, partitioning, alternative spaces, and means of segregation architecture. It is definitely worth your time to check it out.

the male/female separation has a pretty rich history. scores of public schools and churches in the u.s., for example, had separately marked entrances. but for more specific examples i like:

- van nelle outside of rotterdam has separate/intertwined male/female stairs. (actually, because the genders were separated but facing each other, probably more seductive than if people had just walked together.)

- chambord chateau, also intertwining stairs, but used more for the ritual of separation - at least until a meeting at the bottom.

- there was a video by a female iranian, i think Shirin Neshat, about the separation of a worship space:

Just one from personal experience: at Cranbrook Eliel Saarinen designed separate campuses for the boys and girls schools. The boys is, predictably, very chaotic, with separated buildings surrounded by lots of outdoor space for movement between classes, lots of odd alcoves, courtyards, and brick patterns, and generally very aggressive and adventuresome. The girls school is all contained in one building - gated - and all of its rooms are enveloping, almost womb-like, and protective.
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just a personal experience. me being segregated from women.

there is a study somewhere of barragan's house on how the design segregates the servants from the social spaces of the house.

think Jane Jacobs "gender segregation"...also, 1940-50's post war household as the beginning of suburban housewives in america. Might be good to look through old "Art+Architecture" Journals. Or the "case study houses". Lots of imagery of the wife in the kitchen, running the vacuum, etc. may give you insight as to how architecture was seen as idealization of the domestic american dream.

following generico's post, you could also look at the bbc series "upstairs downstairs" about an aristocratic london family and their servants in early twentienth century.

the whole of saudi arabia is a "relevant mega project".

one also must distinguish between islamically stipulated segregation and culturally associated segregation. it is a mistake to assume that all what is nominally conceived of being islamic is by scripture islamic. having said that, there are some tribal traditional khaleejy (gulf arab) dances that are performed by men and women without segregation, which points out to a [/i]cultural[/i] facet, at least, of shared performance and space lacking in the more modern khaleejy environment. therefore, i suspect that the so-called (incorrectly on many accounts) "islamic" segregation is a complex interplay of :
1- genuine scriptural decree
2- modern cultural exagerration of scriptural decree (an instance of this is the face cover worn by women; unlike the head scarf, there is no stipulation for this anywhere in the Koran or the Hadith i believe - correct me if i'm wrong).
3- traditional cultural sediments that have nothing to do with islam(for instance, the circumcision of women in some arab and moslem regions)

there are people who would perceive islam we being not explicitly about segregation as much as it is about seperation. in my opinion, that is a less mischievous (mis)reading.

also on generico's post, you could look at Robin Evans' essay 'Figures, Doors, Passages' in Translations from Drawing to Building. Evans describes the invention of the corridor in terms of the segregation of domestic practices: particularly the separation of servants from residents. Very readable and interesting essay. I have a copy I could send you.