Definitely not normal. In a healthy family relationship, there is respect for personal privacy. Her behavior crosses the line of normal parental - child interactions. You need to take steps to stop this behavior as soon as possible.
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.
In the grand scheme of sexual exploration, it's not entirely abnormal. People sometimes look into different sexual ideas out of curiosity or as part of their sexual self - discovery. But in the context of a relationship, it might seem a bit out of place. It really depends on the nature of your relationship and your mutual understanding of boundaries. If you two have an open relationship where exploring different sexual concepts is okay, then it might be more normal. But if not, it could be a sign that you need to have a conversation about what's acceptable in your relationship.
This is a very uncomfortable situation. You should talk to her seriously and tell her that her behavior makes you feel violated and uncomfortable. Maybe she doesn't realize how inappropriate her actions are.
This is a rather uncomfortable situation. First, you could try to have an open and honest conversation with her in a gentle way. Ask her why she's doing it and express how it makes you feel.
Well, it's a really tough situation. You could try to find out the root cause of why she is into such inappropriate things. Maybe she has some issues in her life that she is trying to escape through this. But still, cheating is unacceptable. You may also seek some relationship counseling to see if the situation can be improved.
Well, first of all, try not to overreact immediately. It could just be a moment of curiosity. Maybe have an open and honest conversation with her about how it made you feel uncomfortable. Communication is key in a relationship.