implementers of some expressions of illicit sex, and not others, as a sexual crime. Zina is transgressive according to Sharia criminal law. While the Sharia does not explicitly name zina as transgressive heterosexuality, it is clear from significant elements of its conceptualisation, that is, its status as consensual sex between a man and a woman who are not married to one another, that zina involves heterosexual sex and that the source of its transgression is its occurrence outside marriage. I begin by addressing the legal and political contexts for the particular form that Sharia has taken in northern Nigeria, before proceeding to examine pre- vailing understandings of zina. Legal formulations of zina are juxtaposed with non-formalised, common-sense understandings, to point to the distinction between formal expressions of principles in Sharia criminal law on zina and popular understandings of such principles. Highlighting this distinction pre- cedes the elaboration of a further distinction, which is that between principle and practice. In this instance, this is the distinction between Sharia and between prevailing Hausa sexual culture as lived cultural practices, engaged in by particular social categories of women and men. Muslim women's struggles against the various controls that have been imposed on them in the name of Islam have taken diverse forms. The interna- tional solidarity network Women Living Under Muslim Laws (WLUML) provides a forum for strengthening women's struggles in diverse contexts of "the Muslim world". These include contexts in which Islam is the state religion; Muslim communities governed by minority religious laws; and secular states where an expanding political presence is manifested in the rising demand for religious laws. WLUML recognises that women within the network will have