Sex preselection techniques designed to help a couple choose the gender of their unborn child have also proven controversial. Because sperm bearing the Y chromosome produce males, couples wanting a male baby attempt to increase the chances of a Y‐bearing sperm fusing with the X‐ovum. A number of sperm‐separating techniques supposedly accomplish this. For example, doctors can impregnate the mother‐to‐be via artificial insemination of primarily Y‐bearing sperm, which they have separated in a test tube. Success rates of sperm‐separating techniques are questionable, with reported figures approaching 85 percent. Critics note that society cannot know the effects of gender imbalances created through sex preselection. Will people prefer more girls than boys? What happens to the future of marriage and family?