推荐回答（1个）
中国古代其实并不是实行一夫多妻制，而是一夫一妻多妾制。也就是说，只有正房才是真正的妻，妾并不是真正的妻，这就注定了正房与妾的法律和社会地位存在重大区别。
正房凭借与夫的夫妻关系，对外分享丈夫社会地位和财富，其地位通常被视为与丈夫等同，高于地位仅次于其丈夫的其它男性，比如亲王的正房，地位高于郡王。对内则是女主人，地位仅次于丈夫，高于其它一切家庭成员，包括儿子。如果丈夫去世，正室在分配财产方面有巨大发言权，继任的家庭男主人不管是否自己亲生的儿子，都要把她作为孝道的主要目标来尊从。
妾与夫不是平等的夫妻关系，而是一种半夫妻半主仆的关系，因此不能分享夫的社会地位。“妾”这个字，从辛从女，本意就是罪女，即女奴的意思。在奴隶制时代的良贱制度中，妻为良，妾为贱，妾不仅与夫有一定主仆关系，与妻也一样，所以妾的对内地位也低下，甚至比自己亲生儿子都低。你看过红楼梦就知道，贾环的地位都比赵姨娘高。
妾唯一比正房“占便宜”的地方是，如果夫犯了十恶不赦的大罪被判灭九族，那正房由于是真正的妻族，她的父族和母族都要被抄斩。而妾由于不是真正的妻，只有她本人作为夫的家庭成员被杀，她娘家人不会受到牵连。
可见，古代封建宗法制度中，夫与正室是法律承认的社会关系，而夫与妾更像是一种私人和临时性的关系。因此，正室和娶与出都是很隆重的事，而妾就简单多了，以至于有的男人先娶妾后娶妻，而且娶妾简单而且对妾的条件要求不高。
妾提高身份的唯一途径就是生育。妾如无生育，能否进族谱都两说着，一旦生育，则算是真正与夫建立了亲缘关系，哪怕只生女儿，社会地位也能上个台阶。如果有儿子，那地位当然就更高了，等于在家庭里开了一房，如果未来这一支子孙繁多，她在族谱中的地位就会很高。但妾即使生子，也不能与正室PK。因为正室生的叫嫡子，妾生的不过是庶子，只有嫡子才有继承父亲财产和爵位的权利，庶子没有继承权，嫡子与庶子间也是存在一定主与仆、良与贱的关系的，哪怕妾先生下长子，也照样没用。
最运气的妾，是待正房早逝后被扶正，并且正房无嫡子，这样她的长子就有望获得继续权了。在这种极品情况下，她可望获得与正房一样的历史地位。
地位差这么多，要不中国古代数千年来，每个妾都盼着正房早S，每个庶子都盼着嫡子早亡呢！
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