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Background: Infertility along with fertility treatments has been reported to have a devastating effect on the well-being of the individuals involved as well as their relationship. So far, the studies exploring the impact on the relationship have mainly focused on heterosexual couples facing infertility and undergoing treatment. There is, therefore, a lack of data on the potential role of sexual orientation, gamete origin, as well as treatment success on the risk of separation after fertility treatment. The purpose of this study was, thus, to explore whether sexual orientation, donation treatment, and fertility success affected the relationship well-being and to explore various separation-related aspects.

Methods: We have performed a prospective cohort study of heterosexual and homosexual couples undergoing fertility treatment with autologous and donated gametes in Sweden and followed them for up to 10 years after receiving fertility treatment. In the current follow-up study, 660 individuals have been included.

Results: Almost 39% of lesbian couples participating reported having separated as opposed to 11–17% of heterosexual couples undergoing treatment with own or donated gametes. Neither background factors nor treatment success protected against separation. By using the relationship satisfaction ENRICH tool, we were able to demonstrate that dissatisfaction of one of the lesbian spouses or heterosexual spouses undergoing oocyte donation increased significantly the risk of separation 8–10 years after treatment commencement.

Conclusion: The findings can be used by fertility clinics to provide relationship tools to the treated couples in order to help them nurture their relationship and decrease the risk of separation in the long run.