Shiho Hata, 40, has participated in many marathons. She is a full-time housewife in her 14th year of marriage and the mother of one child (10 years old). "I'm confident that I have more stamina than anyone else among housewives my age," she says, and it seems she has plenty of sexual energy. She can't seem to be satisfied with her husband, who "gives me a half-masturbation when he's on top," so she spends her days masturbating when he's not looking. "When there's no one at home, I've masturbated for up to six hours straight,"Shiho says, looking somehow happy as she takes out the toys she carries around with her from her bag and shows them to me.