The characters engaging in sexual acts in this show are usually, if not always, teenagers in high school.

Two girls fight over Kota. You see both of them completely nude. You see their nipples too. Kota is also seen in the bath along with the two girls and you see his butt. He is embarrassed as they fight over him, naked. All three are in a bed (Kota wakes up naked with them next to him also naked) and they begin to fight over him again, smothering him with boobs etc.

There is fighting between the two girls over Kota, less nudity in this episode than most. It does have Kota sexually spanking one of the girls though at the end of the episode, and one of the girls taking a bath in the beginning of the episode.

The show itself is very sexual by design. The plot revolves around two girls who want to have sex with a boy named Kota. Every episode has something to do with this, be it fighting over Kota, full nudity, especially of the girls (even nipples on the boobs in some episodes which is not usual for anime), or something else. Lots of sexual innuendo and direct references.