Many sperm donors are voluntary. Surrogates tend to charge, unless they are a member of the family.<quoted text>They pay surrogates and then reproduce
How a child came to be fails to provide any excuse for treating the child any differently from other children.
While children benefit from having parents who are married, they are not a requirement for marriage.
Procreation has never been a requirement in any state or federal law. It fails as an excuse for denial of the fundamental right of marriage. Gender is an irrational restriction in the states that continue to use it as an excuse.