Sex selection is the use of medical techniques to conceive the preferred sex. This practice raises questions about gender discrimination, stereotyping, reproductive autonomy, and the ethics of choosing children with certain traits. In the United States, many organizations oppose sex selection but have nevertheless taken a stand. Sex selection is linked to the idea that a certain sex is superior. People think of gender as categories, boy or girl, not as a fluid. Some say that allowing sex selection is another way of allowing abortions; while others say it is better to choose the gender than to kill the child all together. Clinics allow gender selection for the first or only child. The use of sex selection to balance the family is more common. In America, family balance is used so that parents can have gender balance. In China, family balance is used to address male dominance using sex selection for men in a crowded environment.