This is a complex situation. On one hand, it could be seen as a sign of her being comfortable and open with you. But on the other hand, it might cross the line of propriety in some situations. You might want to consider how it affects your relationship as a whole. If it's causing any discomfort or potential issues in your social or family life, it's time to sit down and have a serious talk with her about respecting boundaries, while also being understanding of her intentions.
No, it's not considered normal in a typical relationship. Looking at someone's private parts in this way is inappropriate behavior. There should be respect for personal privacy in a marriage.
There are many great kids' stories. For example, 'The Little Prince' is a wonderful story about a little prince traveling through different planets and learning about friendship, love, and the meaning of life. It has beautiful illustrations and deep philosophical ideas that are presented in a simple and engaging way for children.
Well, it's not a common or healthy interest. While people can have diverse interests in reading, stories centered around such vulgar topics are not in line with what is considered good taste. It could also potentially be a symptom of a deeper issue, like an over - exposure to inappropriate media. You should try to gently introduce her to more positive and healthy forms of literature.
Adventure stories are great. For example, stories about exploring ancient ruins, like Indiana Jones - style adventures where the hero overcomes various traps and enemies to find hidden treasures.