What is your favourite method act?

Good questions. There's no evidence in the movie, directly or hearsay (conversations between Brando and his mother-in-law) that even hint at abuse. I'd also add the dynamic of Rosa also being involved with another man -- in the hotel she owned and ran, and where she and Paul lived in.

Even better question you raise with Jeanne. I think it starts out with happenstance. Many things in life is just luck. I think she's more intrigued with him than his age. He's not fawning over her, and I'd also throw in Jeanne's boyfriend who is more interested in his movie and using her just for his movie's sake, so she'll get attention elsewhere, and she just happened to meet Paul in a desperate and troubling time for both of them. At first, she seems a little taken back by his personality, but I think that is the reason women become interested - they're intrigued.

I wonder if Jeanne would have shot him anyway, but I think she was tired (and maybe bored when Paul becomes so forthcoming) of Paul, just like she got tired of her other boyfriend (Jeanne Pierre Laud). Bertollucci liked Freud, so I'm sure he added that in, already knowing she would shoot him. Maybe she did it at that point also because she seemed to love her father, and didn't like him poking fun. I think Paul says "How do you like your DEAD soldier?" and it was a good moment to actually display death.