当所有的年轻男孩满脑子想的都是「性」时,你要怎么保护自己的女儿呢?道格(汤尼丹萨 饰,电视影集「妙管家」)是一个标准爸爸,如今,他面对了每个爸爸的恶梦----- 吾家有女初长成 !Doug Simpson is an average father who has to deal with his teenage daughter's transformation into womanhood. And as every teenage boy around her answers the call of their over-active glands, Doug has to wage a one-man war to protect his daughter from them! His efforts send him on night-spying missions, to an explosive drag race, and eventually to jail as he learns what every father with a daughter learns – that sometimes you have to let go to keep the ones you love.
即将和方启宏(吴彦祖 饰)步入婚姻殿堂的程子欣(高圆圆 饰)幸福满满,她偶遇最崇拜的股市女强人杨鸯鸯(杨千嬅 饰),于是自我推荐加入了杨的公司。无巧不成书,张申然(古天乐 饰)的公司刚好在鸯鸯公司的对面,两人之前又因为某次邂逅成为男女朋友。性格大条豪爽的鸯鸯知道申然花心轻浮的行径,却只采取反向操作的措施,一心期望能成为申然最后一个女人。子欣的哥哥程子建(周渝民 饰)浪漫气息浓郁,他偶遇失落中的鸯鸯,神奇的章鱼“灯神”让他们成为好朋友,子建对鸯鸯的好感也与日俱增。终于迎来了申然的生日,谁知派对最终变成了大灾难,混乱中的申然也惊讶地发现子欣就在不远的地方。从未熄灭的爱火再度点燃,三男两女的爱情战争进入了白热化的阶段……