In my paper I discuss the argument that the absence of the legal possibility to contract same-sex marriages is discriminatory. I argue that there is no analogy between the legal situation of same-sex couples and African-Americans, women or disabled persons in the nineteenth century. There are important natural differences between same-sex and different-sex couples that are good reasons for the legal disparities between them. The probability of having and raising children is one of them. Therefore, demanding that same-sex couples have (...) rights similar to those that married couples currently have in Poland and justifying that claim by alleged discrimination is neither correct nor fair. (shrink)