The prevalence of<unk>  use varies greatly between countries. Most surveys of contraceptive use are among married women, or women in informal unions. Japan has the highest rate of<unk>  usage in the world: in that country,<unk> s account for almost 80% of contraceptive use by married women. On average, in developed countries,<unk> s are the most popular method of birth control: 28% of married contraceptive users rely on<unk> s. In the average less-developed country,<unk> s are less common: only 6–8% of married contraceptive users choose<unk> s.
Condom
Vaginal syringe
Vaginal ring
Macy catheter
Dental dam
Word catheter
Hot water bottle
Antimonial cup