 Adults who want children often prefer children of a particular sex, or a “balance” of male and female children, perhaps born in a particular order. Medically-assisted high-tech sex selection raises large ethical issues. PGD involves creating human embryos, some of which will not be used. Freezing, destroying and giving away human embryos can seem inconsistent with respect for human dignity. Sex selection is arguably a kind of gender discrimination and could heighten problems of pernicious gender discrimination. Sex selection plays into gender stereotypes and could someday throw off the societal, even global balance of males and females. Sex-selection is controversial as a first step on a slippery slop toward “designer babies”.