Takumi just cannot stop fantasizing about Saki-senpai, her voluptuous body just stands out anywhere. One day she talks to him on the train and they become friends. Whenever he can, Takumi stares at her form, always getting a hard-on. The next day he finds out they have the same fetish… and so the story begins. (Source: AniDB)

Lamenting over what happened to her class and seeing that Naotatsu is the only one having sex with his female classmates, teacher Suomi takes the rest of her male students to an exclusive swingers area of the beach. Along with some of her foreign female friends, Suomi starts teaching her students a private lesson. [Written by MAL Rewrite]

Led by their foreign female teacher, Suomi, the students of a certain high school set out on a trip to the Yarimoku nudist beach. There is only one rule the students must follow: it is forbidden to have erections. Hoping to create bonds between her students, Suomi pairs the female students with those who need to relieve their erections. Due to the visual spectacle provided by his classmates, Naotatsu Nagato is the first and only to break his teacher’s rule. However, Naotatsu’s seemingly insatiable lust proves to be problematic for his female classmates. [Written by MAL Rewrite]

Mishiro Tamanashi can see the spiritual being called Sanshishi. Ever since he met this entity, his life has changed.

Animated adaptation from the game by the same name.

Based on the adult manga by Miyabi. These OVAs tell us two distinct stories: Pure Hearted Girl: This is the story of Jounouchi Yuuto, a high school student womanizer who is going to fall in love with the new pure hearted student, Kuramochi Konomi, who is very shy. Net Love: This is the story of Rumi, a high school student who practices the “Sex-Web”, a practice which consists of making love from a distance with strangers thanks to a voice chat and a device called “Trans-Hole”. (Source: Nautiljon)

Kaede is the student council president and is also twin sisters with Suzu. Both are childhood friends with Hayato, of which all three are part of the student council. Through their time together, Kaede and Suzu both both fell in love with Hayato. Both try to compete for Hayato’s love and sexual favor.

A special governmental program has been introduced to counteract the declining birth rates of demi-human races suffering due to a lack of male members. Through a so-called “assistance system,” randomly selected humans are required to mate with designated partners—be it elves, sirens, or even dragons. Iris Thea Eaderlindt, an elven princess known for her open-mindedness and friendly attitude towards humans, is transferred to the Ark Metropolitan Academy. Coincidentally, her new teacher has been selected as her mating partner. Anxious yet determined to fulfill her duty of securing the future of her race, she starts partaking in sexual activities with him. To her surprise, Iris discovers that her partner’s ancestors were orcs, well known for their extraordinary sexual prowess. As more demi-human students join the class and find out about their teacher’s “side job,” it becomes increasingly difficult for Iris to keep her partner’s attention solely on her. [Written by MAL Rewrite]