Written before the announcement of a national roll out of antiretroviral treatment in South Africa, this paper uses three illustrative vignettes to draw attention to some major areas of HIV/AIDS vulnerability related to the themes of sex and secrecy within households and families. The vulnerability, particularly of women and young girls, within domains traditionally regarded as ‘safe’, is noted. The dangers for the spread of the epidemic, of the typical ‘silence’ between generations around sex and the immersion of the younger generation in worlds which are essentially hidden from adults, is also commented upon. The silence of stigma and nondisclosure are, further, argued to be essentially inimical to sociability and what has been referred to by various sociologists as communitas, community and the open expression of love, caring and recognition for basic humanity. Even the confidentiality enjoined by law and medical ethics is seen to have a negative side, when it comes to caring for and comforting AIDS infected and affected family and community members. The paper ends with a call for researchers to be aware that AIDS stigma may render the very act of research a source of danger to those affected by HIV and AIDS. Bibliogr., notes, ref., sum. [Journal abstract]