Yes. If Bob knows that the woman thinks he is Joe then he should be charged with non-forceable rape.
Ok. Sylvia Sodbuster goes to a bar and meets a guy. The guy says he is Joe Blow, lead drummer for the rock group, the Ratheads. Sylvia says, “Oh, I love the Ratheads. I love drummers and I love to have sex with rock stars”. They go back to her place and voluntarily have vaginal sex. A week later, Sylvia discovers the guy wasn’t really the drummer for the Ratheads, but is actually an accountant with the Milquetoast Accounting Agency. Is this rape?