Having a hard time remembering the name of this movie....
Asian horror. Has sex and some gore.
At the start of the movie, a woman is walking on the street and sees a accident, and i recall she goes somewhere to masturbate?.
At the end of the film, she is having sex with someone with her on top, and the guy is dying while they have sex. I think she stabbed him or something, cant remember.
I think i recall a form of cell or room where they are at the end of the film.