Nowadays, a geisha's sex life is her private affair.
In her book Geisha, a Life, Mineko Iwasaki said: "I lived in the karyukai during the 1960s and 1970s, a time when Japan was undergoing the radical transformation from a post-feudal to a modern society.
When they regrouped during the Occupation and began to flourish in the 1960s during Japan's postwar economic boom, the geisha world changed.
In modern Japan, girls are not sold into indentured service.
On average, Tokyo apprentices (who typically begin at 18) are slightly older than their Kyoto counterparts (who usually start at 15).
Historically, geisha often began the earliest stages of their training at a very young age, sometimes as early as 6 years old.
The highly accomplished courtesans of these districts entertained their clients by dancing, singing, and playing music. Gradually, they all became specialized and the new profession, purely of entertainment, arose.
Some girls were bonded to geisha houses (okiya) as children.The dances were called "kabuki", and this was the beginning of kabuki theater.These pleasure quarters quickly became glamorous entertainment centers, offering more than sex.It is still said that geisha inhabit a separate world which they call the Karyūkai or "The Flower and Willow World".Before they disappeared, the courtesans were the colourful "flowers" and the geisha the "willows" because of their subtlety, strength, and grace.