五个「圣育强中学」不同年份毕业、各有发展的校友：议员吴郁仁(曾志伟-饰)；影帝张秋云(詹瑞文-饰)；妇科医生傅武琛(王晶-饰）；玄学大师司徒奇峯(杜汶泽-饰)；舞蹈教师林查理(狄易达-饰），一起为恩师朱老师(吴耀汉-饰)庆祝八十岁生辰。 不料，在庆祝的过程中遇上五个年青貌美的模特儿：开放的 Tina(周秀娜-饰)；电影狂迷 Audrey(徐自然-饰)；验身成瘾的倪险(朱裕琳-饰)；被鬼上身的小倩(杨梓瑶-饰)，和经常想破处的 Eleven(江怡-饰)。五人被五个女孩的青春气息吸引一一出轨！

Five graduates from different years come together to celebrate their secondary school teacher Master Jude's 80 year-old birthday. Master Jude is a happy-go-lucky bachelor who enlightened them on the matter of sex during their school days. Since all of the five men have marital problems, this is a good time for them to meet and share their grievances. However, during the celebration party held in a hotel, they encounter 5 pretty, sexy young models. They fall for each other and have a love-fest in the hotel.