Natsumi Shinooka is 40 years old. She is a mother of two who does web design work as a subcontractor for the production company she worked for when she was single. Although she feels fulfilled in her daily life, Natsumi says that even though she has been married for 14 years, she still has doubts that she cannot shake. She thinks, ``Maybe she hasn't had sex with someone she's compatible with yet?'' The number of experienced people is two including the husband.