Sin Sisters (2002)

After graduation from university, childhood friends Ann, Joy, Koi, Mam and Joom move on to follow their respective career paths. They reunite again at a friend's funeral, after which all the five young women decide to stay overnight at Joom's place to recall their good old days. When Ann raises the topic of sex, the conversation goes deeper and deeper until each is forced to reveal details of their most embarrassing sexual experiences - the moments they harbor the most guilt over.