By that logic it should be illegal to marry if you are post-menopausal, infertile, a carrier of a genetic disease, or openly express an interest to remain child

By that logic it should be illegal to marry if you are post-menopausal, infertile, a carrier of a genetic disease, or openly express an interest to remain child-free. Gay families can and do raise children. Being unable to naturally produce children doesn't preclude raising children. My mother-in-law is gay. When she was a young adult, before she came out, she got married and had children because "that's what you did" and she didn't have the courage to go against what was expected of her. She, however, was incredibly miserable. Her distress with being gay and married to a man was a huge contributor to her drug and alcohol addition at that time. As a result her children didn't have a good family life. Finally she was distressed enough to divorce my father-in-law and come out. She's now married to a woman, totally sober, much healthier (she dropped over 100 pounds), and very happy.