Multiple pregnancies are considered an ART complication. The only effective way to reduce its incidence is to transfer a single embryo. Nonetheless, there is some reluctance among the patients to accept this strategy. In IVF/ICSI programs, it has been demonstrated that, after receiving the information about the similar cumulative live birth rate after single embryo transfer (SET) and double embryo transfer (DET) and the obstetric and perinatal risks of multiple pregnancy, a significant number of patients opt for SET. Up to date, no comparable studies have been published in oocyte recipients. The aim of this study is to evaluate if the information given to the patients influence their preference on the number of embryos to be transferred. It also seeks to identify factors which determine the initial preference and factors which can explain a hypothetic change in this preference.

Inclusion Criteria:

• Patients under their first oocyte or embryo donation cycle.
• Sufficient knowledge of Spanish to fill out questionnaires.

Exclusion Criteria:

• Patients with a medical indication for single embryo transfer (e.g. Turner syndrome, uterine surgeries, cardiovascular risk).
• Having had previous oocyte or embryo donation cycles.
• Insufficient knowledge of Spanish.