This study shows how social workers reason about the concepts of gender, gender roles and equality and if these arguments reinforce heteronormativity that could affect the ability of same-sex couples to adopt children. The reasoning regarding equality indicates a difference between heterosexual couples and same-sex couples. What emerges in the study is that the social workers reasoning can be explained with that they have been imbued by heteronormativity. Heteronormativity becomes a contributing part of how same-sex couples are seen in the adoption process. Arguments for equality, which erase stereotypes, do not apply in the same way for same-sex couples as for heterosexual couples. Regarding same-sex couples the equality is based on stereotyped gender roles that reinforce the heteronormativity. This implies a paradox between arguments for equality, which reinforce heteronormativity, and the possibility for same-sex couples to adopt children.