Abstract Although there are a variety of ways in which people navigate their intimate lives, theories of human development and intimacy often implicitly assume a preference for monogamy to be universal (Seltzer, 2000; Conley et al., 2017; Moors et al., 2017). While many people around the globe indeed engage in serial monogamy, remarkable transformations in relationship and family demography have occurred over the past several decades (Glick, 1988; Fisher, 1989; Finkel et al., 2014; Foster, 2016, in Moors et al. 2021) Studies show that 1 out of 6 people (16.8%) desire to engage in polyamory, and 1 out of 9 people (10.7%) have engaged in polyamory at some point during their life. (Moors et al 2021). Besides seeking hypotheses on the reason for this change away from the monogamous relationship form, and based on these data, we can try to make a prediction about the willingness of people to also consider parenthood in consensual non-monogamous or polyamorous relationships and thus engage in polyparenthood in the future. In the fertility centre too, we are past an era in which heterosexual infertile couples form the majority of our patient population. The need for donor material is increasing, although demand grossly exceeds supply. In addition, in many countries donor anonymity is still enshrined in law, which poses a problem for a growing number of acceptors. Many patients desire information about the donor and an increasing number of patients anticipate the perspective of the future child, which has a right to know its origins. Other patients wish the donor would also include parental involvement, and fundamentally desire the genitor to be a co-parent for their child at some point. As a result, some patients seek refuge in non-regulated open donation arrangements outside the fertility clinic. Indeed, internet websites dedicated to facilitating contact between individuals who want to meet people with the common aim of having a child are mushrooming. Such websites make elective co-parenting accessible to large numbers of people, including both singles and those with partners. Furthermore, these websites are not restricted to LGBTQ+ individuals; heterosexual men and women can also become members and contact potential reproductive partners who may be of a different sexual orientation to themselves. This could trigger a paradigm shift in the fertility clinic; is co-parenting, multi-parenting and poly-parenting the future? It could resolve problems of donor shortage, and the often difficult search for roots still faced by donor-conceived children as a consequence of donor anonimity. At Brussels IVF, we anticipated this paradigm shift and developed a procedure to counsel candidates for co-parenting. Welfare of the child is the guiding principle leading to a joint parenting project worked out together with the co-parents. This procedure and counseling topics to be addressed by the fertility centre will be presented.
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