Actually, you really aren’t supposed to think of how any couple gets the sperm and egg joined. Even heterosexual couples don’t consider that anyone’s business.
Actually, that's the problem here. People not thinking out the implications of the profound problems inherent in artificial reproduction and the reduction of fatherhood to a 5 mL squirt.
I assume Mary Cheney, who seems warm, intelligent, and attractive, has simply not thought out the consequences of raising a boy who knows that his maleness per se, his relationship to that annihilated thing called fatherhood, is worth very nearly nothing.
But you areally aren't supposed to think...