This study examines romantic attachment, internalized sexual stigma, relationship satisfaction, and motives for parenthood in a sample of 313 Italian lesbian women (47.9%) and gay men (52.1%) aged 18–71 years (M = 36.2; SD = 11.9) and in same-sex relationships. The following hypotheses were tested: that romantic attachment is positively correlated with internalized stigma and motives to not have children, while it is negatively correlated with relationship satisfaction; that relationship satisfaction is negatively correlated with internalized stigma and motives for parenthood; that internalized stigma is negatively correlated with motives for parenthood; and that relationship satisfaction mediates the relationships between romantic attachment and motives for parenthood and between internalized stigma and motives for parenthood. The results strongly support the hypotheses. Furthermore, the results indicate that the lesbian participants reported lower levels of avoidance and internalized stigma and higher levels of relationship satisfaction and motives to not have children, and the participants in civil unions reported lower levels of anxiety and internalized stigma and higher levels of relationship satisfaction and motives to not have children. Taken together, our findings contribute to the growing body of research on LG parenthood and may inform social policy and psychological support for LG individuals pursuing parenthood.