Despite the growing routinization of prenatal diagnosis, little research has examined men's roles in this reproductive arena or these technologies' possibilities for reinforcing or transforming gender roles and relations. The authors analyze male partners' participation in the amniocentesis decisions of Mexican-origin women at high risk for problems, drawing on interviews with 157 women and 120 of their male partners. The primary aim is to explore whether the normalization of prenatal testing poses a threat to women's autonomy in this decision arena. (...) The findings challenge critics of new reproductive and genetic technologies who assume that these technologies inherently represent male attempts to control women's bodies and the processes of reproduction. In contrast, the authors find many couples try to balance their desire to share equally in parenting responsibilities while maintaining the woman's ultimate control over her body and decisions associated with it. (shrink)