Methods for natural and voluntary selection of genders

We are just starting to understand the complexity and the multiple factors influencing the natural choice of genders. This selection has a certain interest in the prevention of diseases or abnomalities which transmission is linked to sexual chromosomes. By combining different methods we can arrive to success rate of 80 to 90%. This stastically significant rate can be improved and we foresee in the near future the possibility for the couples to choose not only the number of their offspring but also their gender