There are various reasons why couples may wish to conceive either a baby boy or a girl. Family balance or societal pressures are some of the reasons. Rarely, there may be a medical reason why a child of a particular sex is desired.
But sex selection purely for social reasons has ethical and demographic dilemmas, and is medically illegal in many jurisdictions. However, advanced medical technology and increasing demand for sex selection have both created the need for more debate on the matter.