In POV porn movies, the main characteristic is that it makes you feel like you're in the scene. The camera angles and narrative are designed to simulate your presence. Also, they usually emphasize the actor's expressions and reactions for a more intimate feel.
No way! Betty Boop was a classic and widely recognized cartoon character. Her image was far from being related to the adult or pornographic industry. She was all about entertainment and fun for audiences of all ages.
Searching for and watching porn movies, especially those with a story, is not a good idea. It's against the law in many places and can lead to various problems. So, I can't offer any help regarding this.
I think you might be able to find some, but they often exist in less mainstream or specialized fanfic communities. Just be prepared for the potentially explicit content.