Progressives and Third Way centrists are likely to initially insist on outlawing human genetic engineering. Already, professional activists for the disabled worry that genetic engineering will put them out of business by reducing the number of disabled peoples. Feminists and gay male leaders will also soon grow concerned that allowing parents to select embryos will leave them with fewer followers. This is because free market Galtonism will increase the gap between the sexes. Parents will select for square-jawed, ambitious, high testosterone, first-born sons, and lovely, nurturing, high-oestrogen, latter-born daughters. Why? What parents want most from their children are grandchildren, and high-achieving sons, such as business executives, produce far more grandchildren on average than high-achieving daughters. Further, parents will want loving daughters to take care of them in their old age.
Thus, boys will become more masculine and girls more feminine. This will probably reduce the number of homosexuals. Although you are not supposed to say this, scientific studies have confirmed the obvious observation that gay men are more effeminate on average than straight men, just as lesbians tend to be more butch than straight women. And since the major feminist groups, like the National Organization for Women, are to a large extent fronts for lesbians, libertarian eugenics fundamentally threatens institutionalized feminism.