This study used a person-centred approach to consider profiles of parent-child sex communication. We sought to determine whether profiles of sex communication were distinguishable from one another based on aspects of both the parent and the child. Participants included 596 US young people (51% female at birth; Mage = 14.55, SD = 1.70, 56% white), and their mother (n = 596; Mage = 41.23, SD = 8.18; 64% white) and father (n = 354; Mage = 43.44, SD = 8.56; 62% white) figures. Analyses suggested three profiles of parent-child sex communication with mothers and four with fathers. Patterns were similar across profiles, with variation being primarily the degree to which parents reported timing, frequency and quality of communication. Parents who more strongly endorsed proactive and reactive parenting, and who reported more frequent and open conversations with their children were warmer and had higher levels of self-efficacy. They also had children who were more sexually active, but who had healthier sexual outcomes. Discussion focuses on the importance of considering multiple aspects of parent-child sex communication and highlights the importance of continuing to empower parents to discuss sex and sexuality with their children.