My Childhood Friend Is an Easy Girl.

This series has been dropped by author

His college life began with the high school graduation ceremony of his wife, who was a childhood friend of the main character.
The main character couple builds relationships with characters of various sexual orientations.

A woman who enjoys virginity hunting, a couple who wants to swap, a man and a woman who have a lover but want to have an affair, a man who only sees women as an outlet for his sexual desire, a woman who is excited about being forced, a man and a woman who enjoys a one-night stand, and a wife who is embraced by another man

From now on, the turbulent sex life surrounding the main character couple unfolds, such as a man who is excited to see things and a woman who is excited to see her husband being embraced by another man .