爱情、性行为、痛苦与快乐模型

根据神经系统在学习、记忆和遗忘过程中表现出的特征和心理感觉，构建了一个快乐模型。在快乐模型中，作者把自由、快乐、幸福和痛苦等心理感觉统一到一个数学公式中，并且提出了神经依赖和痛苦的阶段性消失特征。根据建立的快乐模型，分析了爱情文化和性文化的形成和发展过程。最后指出：爱情文化和性文化是快乐模型的两个应用案例，并且给出了可能会产生自由爱情的四个基本条件。

Love, sexual behavior, pain and pleasure model

According to the characteristics and psychological feelings that nervous system showed in the process of learn- ing, memorizing and forgetting, the author built a pleasure model. In the pleasure model, the psychological feelings of freedom, pleasure, happiness, and pain are unified into a mathematical formula, and the stages of disappearing process of nerve dependence and pain have been proposed. According to the pleasure model, the author analyzed the formation and development of love culture and sex culture. Both love culture and sex culture are two application cases of the pleasure model. Moreover, four basic condi- tions that could produce free love have been proposed.