I'm thinking of saving porn on my phone
Why do you want to store porn on your phone?
I'm creating my own databases, so I can reference them whenever I want.
Just make sure you have the files in a secure location on your phone. Wanting to look at porn is natural, but if someone accidentally saw it on your phone, you might be embarrassed. Also, make sure you are not developing an unhealthy obsession with porn.
You worry too much.
I just worry that someone will find it and think you are a pervert. You wouldn't want to risk somebody from work or a family member seeing what kind of porn you watch.