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男人纵欲过度的表现
稍有性生活体验的男人大都有这样的感受，每次房事后都可能出现程度不等的眼睛胀痛、视物模煳、眼球转动不灵活等症候。
持续时间因人而异，有的稍事休息就会恢复，有的则要持续一两天。性生活越是频繁，眼睛不适的程度也就越严重，持续时间也越长。为什么性生活与视力变化挂上了钩呢？这得从眼睛与大脑的关系说起。
原来，从颅脑发出的脑神经有12对，而分布于眼睛的就达到5对之多，分别主管视力与眼球活动。同时，眼睛的血液主要由颈内动脉与大脑后动脉供应，过性生活时精力、思维高度集中，需要消耗一定的能量，而此时全身血管扩张，流向大脑的血液减少，眼睛的血液供应受到限制，因此一过性生活，眼睛的不适感便“应运而生”了。
由此可见，老祖宗“纵欲伤身”的告诫确有道理，男人们不可不放在心上哦。
纵欲伤的究竟是男人的什么呢？以往多归咎于频繁的性生活消耗了过多的体力与能量，造成身体过度疲劳。但从最新的医学研究成果来看，主要还是精液耗损过多。
精液中除了含有水、果糖、蛋白质和脂肪外，还蕴藏有多种酶类与矿物元素，而这些成分在男人的生命运作机制中扮演着不可替代的角色。
锌对人体的重要性不言而喻。据测定，每毫升精液中的锌含量达150微克，含量之高是其他任何机体组织所不能比拟的。如果以每次性活动消耗2~6毫升精液计算，一次性生活即可丧失锌元素300~900微克。要知道，一个60公斤体重的男子体内锌元素的总量也不过1.5克左右。纵欲过度将导致锌的严重缺失
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