No. Such topics are inappropriate for public discussion as they involve private and often sexually explicit content that violates public decency standards.
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.
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.
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.
I'm not sure specifically what that particular 'giant black dildo story' is about as the title is rather unclear without more context. It could potentially be a fictional or perhaps a very strange and specific anecdote within a certain community or narrative.
Perhaps 'My Girlfriend and an Uncomfortable Scene'. It allows you to approach the topic in a more tasteful manner, without getting into inappropriate details.
Some appropriate topics could be 'How to build trust in a relationship'. Trust is fundamental in any relationship. It involves being honest with each other, keeping promises, and being reliable.