ObjectivesAdolescent and young adult (AYA) breast cancer patients are often faced with sexuality-related problems. Since healthcare providers are often unfamiliar with problems specific to AYA cancer this topic is too little integrated into routine oncological care. The objective of this study was to analyze sexuality, fertility, family planning, family life, and partnership regarding satisfaction and supportive care needs in AYA breast cancer patients.MethodsA total of 139 AYA breast cancer patients were examined twice, 1 year apart. The patients were asked to complete several questionnaires and to answer multiple questions about satisfaction with sexuality, fertility, family planning, family life, and corresponding supportive care needs in these domains.ResultsWhile the patients were largely satisfied with their family life and partnerships, they were less satisfied with their sexuality and family planning. Only small mean score changes were observed in these variables over the course of a year. Being a parent already and having the possibility of further completing family planning were strongly associated with higher satisfaction and lower supportive care needs in these domains. Satisfaction was generally negatively associated with supportive care needs. Older age was predictive of lower satisfaction with sexuality at follow-up.ConclusionAYA cancer patients deserve special consultations concerning the impact of cancer and treatment on their sexuality and fertility, and it is especially important that women who have yet to complete their family planning be actively offered information and support concerning sexuality and fertility protection before beginning treatment.