故事发生在一间名为咏花寨的妓寨之中，其中坐镇着美艳风流的花艳红（利智 饰）、芙蓉出水的陆千千（关之琳 饰）、清纯可人的玉叶和热情奔放的金枝。艳光四射的女子们让咏花寨成为了所有男人们垂涎三尺的桃源乡，每一个华灯初上的夜晚，都是这里最为热闹之时。政府颁布了禁娼令，并派遣了禁娼专员程立邦（郑少秋 饰）前往咏花寨进行暗访，和程立邦一起的，还有他的未婚妻莉莉（刘嘉玲 饰）。哪知道，即便刚正不阿如程立邦，却也无法抵挡花艳红等人的诱惑，发现自己的未婚夫心猿意马，焦急的莉莉只得转而向警察厅长朱爷（秦沛 饰）求助。

Before the Big Ban on prostitution, West Hong Kong is famous for its houses of pleasure. The most infamous of them all is Floral Ode House. Among its girls are Yen Hung, who becomes a widow regularly; aristocratic Chien Chien; Cherry Fun, who manages to lose the nickname; and a bevy of beauties. The madam who is on good terms with the police chief claims the best business this side of virtue. Then there comes from England Cheng Li-Peng, commissioned to ban prostitution. He is engaged to Lily, the police chief's daughter. But his parents had arranged a wife for him when he was an infant. They have lost trace of each other. Cheng Li-Peng starts his investigation, which lead him to Yen Hung's and Chien Chien's bedrooms. He is surprised to find himself in love with all three girls. And one of them turns out to be his missing fiancee!