On the contrary, this is a very valid argument. If you ask ANY heterosexual couple, they not only married to show love and commitment, but to bring into this life children to raise. Whether you accept the fact or not, it IS biologically impossible for gays to concieve a child without the bringing in of a 3rd party. Many said that there are sterile couples that are still married; the government strongly dislikes this. It is impossible for the government to go through every single couple and prove if they are sterile or not; its just the fact that there are so little of them its a waste of time. Children are greatly beneficial to society, seeing as gays cannot creat a child, they do not deserve the benefits of society and marrige itself. Besides this, you have to think about something beyond just procreation. Men and women's differences go far beyond just anatomy. For a child to be raised properly in a society of both sexes, they need a male and female parent.