The arguments for in vitro fertilization are terribly practical. That’s an expression I borrowed from C.S. Lewis. “Terribly practical,” that is. Prescient as Lewis was, I don’t think he ever delved into the ethics of IVF. Actually, I take that back. His 1945 conclusion to the Space Trilogy foresaw a time when human beings would “learn how to reproduce [themselves] without copulation”—and that is precisely what IVF offers. I do not say that in vitro fertilization is a terribly practical