No. Such topics are inappropriate for public discussion as they involve private and often sexually explicit content that violates public decency standards.
Well, it could be that she was exploring her own sexual desires in a solo way. Maybe she found that the black dildo had certain features she liked, like its shape or texture.
This is a very personal and uncomfortable situation. First, you should try to have an open and honest conversation with your wife about your feelings and boundaries. Maybe she has some needs or curiosities that she hasn't properly communicated with you before.
Definitely not. Such content is inappropriate in almost all social and cultural contexts. It goes against the values of decency and respect for others, and can also be considered offensive and unethical.
It could be normal if you both have had open conversations about sexual preferences and fantasies. If you are okay with her exploring her sexuality in this way and she feels comfortable with you being aware, then it can be a normal part of your relationship dynamic. But if it makes you feel uneasy or if there hasn't been proper communication, it might not be a healthy situation.
No, it's not a common type of story. Such a story with this specific topic is rather niche and might be considered inappropriate or too private for general discussion.