古代女子出嫁必看的画是嫁妆画。这些画作内容主要涉及男女房事相关的知识，其目的是为了在女子出嫁之前进行性教育。在古代，女子的教育十分重要，然而由于传统观念的限制和传播手段的缺乏，女子往往缺乏必要的性启蒙。

在古代社会中，女子要遵循三从四德的原则，且在婚前多数时间都是在家中闭门不出。因此，女方很少有机会接触到关于性知识的讨论和教育。为了弥补这一缺陷，女方的父母会在女子出嫁之前准备一些特殊的东西，如嫁妆画。这些嫁妆画起源于先秦时期，被视为一种性教育的方式。
嫁妆画通常由大约12张画作组成，每张画上都描绘了男女房事中不同的姿势和技巧。这些画作与古代时期的春宫图、春宵秘戏图以及熙陵幸小周后图等类似，但嫁妆画的主要目的是为了教育女子。这种方式通过图像和视觉的形式传授性知识，使女子在嫁到夫家后能够了解和应对性生活中的一些常识和技巧。

嫁妆画的存在可以说是古代女子性教育的一种创新方式。虽然现代人看到这些画作可能会感到尴尬和不适，但它们在当时起到了传授性知识和启蒙女子的重要作用。嫁妆画的使用也反映了古代社会对于性教育的重视和对于女子婚姻生活的关注。
总之，古代女子出嫁必看的画就是嫁妆画。这些画作通过视觉形式传授性知识，帮助女子在嫁到夫家后了解和应对性生活中的一些常识和技巧。嫁妆画的存在反映了古代社会对于女子教育和婚姻生活的重视。尽管现代人对于这种方式可能会感到尴尬，但它们在当时对于女子的性启蒙起到了重要的作用。

----------Introduction in English----------
The painting that ancient women must see when getting married is a dowry painting. These paintings mainly involve knowledge related to sexual intercourse between men and women, with the aim of providing sex education before women get married. In ancient times, women's education was very important, but due to the limitations of traditional concepts and the lack of communication methods, women often lacked the necessary sexual enlightenment.
In ancient society, women had to follow the principle of Three Obediences and Four Virtues, and they stayed at home most of the time before marriage. Therefore, the woman rarely has the opportunity to engage in discussions and education about sexual knowledge. To make up for this deficiency, the woman's parents will prepare some special things, such as a dowry painting, before the woman gets married. These dowry paintings originated from the pre Qin period and were seen as a way of sex education.
A dowry painting usually consists of about 12 paintings, each depicting different postures and techniques in sexual intercourse between men and women. These paintings are similar to ancient Spring Palace paintings, Spring Lantern Secret Opera paintings, and Xiling Xingxiao Zhou Hou paintings, but the main purpose of dowry paintings is to educate women. This method imparts sexual knowledge through images and visual means, enabling women to understand and cope with some common sense and skills in sexual life after marrying their husband's family.
The existence of dowry painting can be said to be an innovative way of ancient women's sex education. Although modern people may feel embarrassed and uncomfortable when they see these paintings, they played an important role in imparting sexual knowledge and enlightening women at that time. The use of dowry paintings also reflects the ancient society's emphasis on sex education and attention to women's marital life.
In short, the paintings that ancient women must see when getting married were dowry paintings. These paintings impart sexual knowledge through visual means, helping women understand and cope with some common sense and skills in sexual life after marrying into their husband's family. The existence of dowry paintings reflects the ancient society's emphasis on women's education and marriage life. Although modern people may find this method awkward, it played an important role in the sexual enlightenment of women at that time.