The number of JoJo mangas can be a bit hard to pin down precisely. There are the main series volumes, along with special editions and related works. But you can expect a substantial collection over the years.
The length of the JoJo manga varies depending on which part you consider. Some parts are shorter, while others are more extensive. In total, it's a substantial body of work that has captured fans' attention for years.
When you see a girl you like in a hotel, you can first observe her behavior and words to find some common topics to start a conversation with. If she's interested in you, she might take the initiative to chat with you or invite you to do some activities together. If she's not interested, please respect her decision and don't force contact or pester her.
The concept has a significant impact on the JoJo fandom. Firstly, it deepens the connection between fans and the characters. By imagining characters reading fanfiction, fans feel closer to them. Also, it can inspire new trends in fanfiction writing. Writers might start creating stories specifically with the idea of a character's reaction in mind, leading to more diverse and interesting fan works. Moreover, it can increase the sense of community as fans share their ideas about characters and fanfiction.
Definitely not. Unless it's in a very specific, consensual, and appropriate medical or sexual relationship context (which is also highly regulated), touching someone's penis without permission is completely unacceptable behavior. It violates personal boundaries and can cause a great deal of discomfort and harm to the person.