Biological processes in mammals represented by the current model of reproduction bring into existence incarnate organisms. These processes are triggered by interactions of heterosexual partners within their lived-in worlds in real time. The tacit assumption, that the quality of the lived-in worlds of humans and other mammals are as similar as the biological processes are, turned out to be erroneous and is still distorting our scientific model of man.

As a matter of fact, today the lived-in world of humans is regarded as an interpersonally (socially) constructed reality differing decisively from the species-specific lived-in worlds of other mammals predominantly ruled by biological principles.

Therefore, the coming into existence of incarnate human beings and their essence is to be described by the model of human’s everyday life and secondly by the current model of reproduction in mammals. Then fertilisation is a basic social event constituting humans as twofold realities. From then on, the biologically produced organism will continually represent particular parts of the parental micro- and macro- social reality as the unique immaterial characteristics of the descendant.