A lonely young man is in dire straits, but his friend's mothers don't see him as a boy, but as a man, and take extra interest in him.

和男友发生性关系后的世珍非常苦恼，因为她只感受到了私处的剧烈痛感，没有性高潮带来的快乐，倾听世珍诉苦的亲密姐姐美珠经过深思熟虑，向世珍介绍了专业的性爱老师尹秀，世珍对男友说要出差一个月，偷偷的接受尹秀的性爱私教，性爱技巧逐渐觉醒并变得熟练的世珍，终于体验到了性高潮的快乐....