5.体成熟 ▲定义： 6.适配年龄 ▲定义：
5.体成熟 ▲ 定义： 6.适配年龄 ▲ 定义：
Hormones as Mediators of Development Sex steroids Low Unchanged Adult level Feedback Operative and Decreasing in Operative at sensitive sensitivity adult level Gonadotropins Low Increasing Adult level Hypothalamus Hypothalamus Hypothalamus LRF Pituitary Pituitary Pituitary LH FSH LH FSH LH FSH Gonadal Gonadal secretions secretions Gonad Gonad Gonad PRE-PUBERTY ONSET OF PUBERTY ADULT
Hormones as Mediators of Development
第二节性行为(Sexual Behavior) 一、概念 二、性行为序列(Sequence of Sexual Behavior, Sexual Behavior Chain) 性激动→求偶→勃起→爬跨→交配→射精→交配结束 三、性行为的调节和影响因素
第二节 性行为(Sexual Behavior) 一、概念 二、性行为序列（Sequence of Sexual Behavior, Sexual Behavior Chain) 性激动→求偶→勃起→爬跨→交配→射精→交配结束 三、性行为的调节和影响因素
