Until the middle of the twentieth century, family planning was commonly con
demned as an immoral enterprise. This chapter argues that ethical disapprov
al made access to fertility regulation difficult, and that while the rich a
nd educated were often able to access the services they needed, typically t
he poor could not. Thus, ethical interpretations caused much of the differe
ntial fertility observed between social classes, ethnic groups and ultimate
ly much of the explosion in population that has characterized the last 50 y
ears. Since the 1960s human rights have been interpreted to encompass the r
ight to decide the number and spacing of children and as a result access to
contraception has improved. Where several methods of contraception (backed
up by safe abortion) are available, fertility always falls. But, unfortuna
tely, consensus has not been reached on how to specify particular sets of r
ights (e.g. decision-making for adolescents), and no consensus exists on ho
w to balance the opposing rights of the mother and fetus in the case of abo
rtion. The ethics of the one-child family in China is also noted.