The recent Judgement of the European Court of Justice (Grand Chamber) of 1 March 2011, in case C-236/09 (Association belge des Consommateurs Test-Achats ASBL, and other v. Conseil des ministres) imposes an absolute rejection of the use of sex as a determining factor in the assesment of risk and the setting of individuals' premiumns and benefits in private insurance contracts. In the view of the authors, the Judgement constitutes an undesirable development in the acquis of EU anti-discrimination law and, most vertainly, in the technical regulation of insurance mechanisms. After setting the analytical grounds on the insurance risk (or aleas), its assesment and evaluation (even by indirect means) through statiscical methods, the authors clearly criticise the ECJ Judgment of 1 March 2011 and advocate for and justify the capital importance of the use of sex as a determining factor in the assessment of risk and setting of infividuals' premiums and benefits in private insurance contracts.