The section comparing cultural attitudes about birth control in the United States with those in Japan makes for some especially interesting reading, including Grigg-Spall's speculation about why women in Japan are much less likely to choose hormonal contraception and instead are more likely to use condoms and fertility awareness methods
Right beneath it is fertility awareness methods
(also called natural family planning), where a woman determines her fertile days and abstains from sex during that time; this method has a 75-99% effectiveness.
Requires a woman to only track the first day of her period in order to use; other fertility awareness methods
require daily analysis of fertility symptoms.