Sperm separation was developed in the USA in the 1970s and can be used to prevent many gender-related hereditary disorders. But the technique only raises the proportion of male fetuses to 70 %, so it is not widely used for gender selection.
精子分離術在一九七○年代由美國產生，有許多與性別有關的遺傳疾病可以藉此分離，但分離出男嬰的成功率只有百分之七十。