The IUD is a method of birth control in which a device is inserted into the uterus which interferes with sperm function and prevents implantation of the fertilized egg. In 1909, researchers reported on their success of IUDs made out of silkworm gut. Also, oral contraceptives are not as readily available in Japan as they are in the rest of the world. Orgasm is the best cure for menstrual cramps. The muscle that is being squeezed by the cramps is the one that is released by orgasm.
Extreme obesity is considered very attractive to some Polynesian and Hawaiian natives.
This is just an example of the standards of feminine attractiveness varying from one culture to the next. In Melanesia, they prefer thigh tattoos, while in the United States, the breasts and buttocks are the preferred places for the growing trend in body art.