The current study aims to assess the non-inferiority of a multidose GnRH antagonist treatment regimen to a GnRH agonist long protocol in young infertile women (< 36 years) with good prognosis undergoing ovarian stimulation with Pergoveris® for intracytoplasmic sperm injection (ICSI) because of non-borderline male infertility. In addition, the safety of ovarian stimulation with Pergoveris will be evaluated for both treatment regimens, especially with regard to the incidence of OHSS.