性爱是人生不可缺少的需求。具体地说,它包括生理、心理、情感、健康、进取需求,各种需求相互依存,相互制约。生理需求人类的性爱已脱离了象动物那样的机械性周期性发情。人类步入青春期,随着生殖器官的发育成熟,体内性激素水平在不断分泌增加,当性激素水平达到一定程度时,通过内分泌轴(即:大脑—脑垂 Sex is an indispensable need in life. Specifically, it includes physical, psychological, emotional, healthy, progressive needs, interdependence of needs, and mutual restraint. Physiological Needs Human sexuality has escaped mechanical, periodic estrus, like animals. Human into adolescence, with the reproductive organs mature, the body’s secretion of sex hormones continue to increase, when the level of sex hormones to a certain extent, through the endocrine axis (ie: brain -