Traditionally, marriage is a bond for life between a man and a woman. In our culture(s), it has become a ritual to testify that there is such a bond that is required in order to raise children successfully and prepare them for life as adults. Since "children cannot go their own way", such a bond is required whether it manifests itself in terms of traditional marriage or by a stable relationship without marriage.

Those in favour of merely spreading their sperm without such a relationship do not intend to raise children and have none. In the end, they will pass away from this earth one day without anyone to mourn their departure. Sad!