No. It is not only inappropriate but also may make others uncomfortable. There are boundaries in communication, and this clearly crosses those boundaries.
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.
This is a rather personal matter within a marriage. In a relationship based on strong communication and respect, such an act might be acceptable. It could be part of the couple's unique way of expressing closeness. However, from a health perspective, there are things to be cautious about. For example, using a clean and sharp razor to avoid cuts and infections. Also, it's essential to communicate any discomfort or concerns during the process.
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.
You should have an open and honest conversation with her. Discuss your feelings and any potential risks. You might also want to do some research together on the proper way to do it safely. If you're not comfortable, be clear about that. It's all about mutual respect in a relationship. You could also suggest alternative ways to maintain hygiene if you're not into the shaving idea.