The heteronormative order is based on the categorisation of people into men and women. The categories of man and woman are understood as given, fixed, ahistorical, and universal. Trans* identities represent a ‘border area’ where categories of woman, man, and binary differentiation between ‘male’ and ‘female’ bodies are redefined and re-established. This article is based on an analysis of 18 semi-structured interviews with trans people in the Czech republic. The first part of the article is focused on the ways in which trans* people relate to their bodies. The second part discusses the gender aspects of hormonal body modification. The third part raises the question of passing and legibility in the context of body modification and the representation of their own gender identity.