[Saori, 30 years old] Had her first sexual experience at 16 and began masturbating in her second year of middle school. Experiencing orgasm for the first time opened her up to a whole new world of curiosity. [Ikue, 34 years old] A divorced mother of one child. She emphasizes the scent of a man's nape as a crucial factor when choosing partners. [Naoko, 38 years old] Lost her virginity at 15 with a same-age boyfriend. Due to lack of knowledge about masturbation, she didn't try it until she was 20. [Fumiko, 45 years old] Had her first sexual encounter at 17 with a friend through a telephone club, an experience that left her feeling a sense of loss. She began masturbating only after graduating high school. [Satomi, 36 years old] A wife originally from Taiwan. She had her first sexual experience at 20 and believed it was normal to have silent sex without making any noise. Her sex life with her husband is bland, lasting only about five minutes each time, and she rarely reaches orgasm. [Mio, 30 years old] Had her first sexual experience at 14, which others considered early. Since second grade in elementary school, she had been touching breasts and genital areas with her female friends. [Sayuri, 37 years old] Enjoys daily sex with her fuck buddy. Driven by insatiable desire, she sometimes has sex day and night, exceeding 50 times per month. She had her first sexual experience at 16, during her first year of high school.