Yûji Tajiri

Haruka (Rinako Hirasawa) is a single mother who meets a new guy. Hiroshi (Mutsuo Yoshioka) is unemployed, but gets along well with her son. The two lovers get along great. So great that they are having frantic sex whenever they are together. (imdb)

"When 28-year-old Tomomi is dumped by her boyfriend she seeks solace in the arms of 20-year-old student, Takao. A relationship develops through which Takao comes of age sexually and Tomomi discovers a side to love she has previously not known."

At twenty Kaede is not thrilled about her apprentice job at a hair salon or her man or her town or anything much really. Then she hears that Takuya, a former crush, is back in town from Tokyo after several years. Kaede is not loyal so she is interested. Takuya, however, comes across as not. (mubi.com)

Early 2000s pinku film.

Minori is a head-strong photographer who is romantically involved with Kushida, her editor. On a photography assignment, she gets into an argument with her subject, Ageha, a female erotic manga artist who, like Minori, is 30 and single. Shin'ichi, the journalist on the assignment, receives most of the blame for the failure of the project. Minori sleeps with Shin'ichi, then discovers that her own position is not as secure as she thought when she suspects that Kushida is also involved with Ageha.