The interaction between multilingualism and emotions has so far mostly been researched in Northern contexts. The findings obtained suggest that the first language is typically preferred for emotional and mental activities (i.e. 'first language primacy'). In this article, we extend this area of investigation to Africa. We use the Bilingualism and Emotions Questionnaire to probe first language primacy in South Africa, employing a novel analytical approach -- multiple correspondence analysis -- that allows us to examine the relationship between particular languages and their order of acquisition. Our findings, in part, do reflect favouring of the L1, but with two important qualifications. First, English is also widely used for emotional expression in non-intimate domains. Second, L1 isiXhosa speakers prefer English for mental calculations, and isiXhosa is generally not associated with positive emotional characteristics. We explain these trends in relation to the multilingual context of South Africa, which, like many postcolonial countries, uses a former colonial language extensively in formal institutional spaces.