Ms. Hast told the jury about three more women who would testify that Mr. Weinstein attacked them. The accusations by these women were not charged in the indictment, but their accounts, like Ms. Sciorra’s, will be used to bolster the prosecution’s contention that Mr. Weinstein has a pattern of predatory behavior.

One of the women, an actress, will say Mr. Weinstein lured her to a hotel room in TriBeCa with the promise of discussing a movie and penetrated her with his fingers against her will, Ms. Hast said. Later, the prosecutor said, Mr. Weinstein demanded that the actress have sex with him and his assistant at a hotel in Midtown Manhattan in exchange for parts in three films.

A second actress, who worked as a waitress at a cocktail lounge that Mr. Weinstein frequented, will testify that Mr. Weinstein sexually assaulted her after inviting her to his TriBeCa apartment for a business meeting, according to Ms. Hast.

The third corroborating witness, a young model from Pennsylvania who was looking to start an acting career, met with Mr. Weinstein in 2013 at a hotel bar. The producer took her to a hotel room, where he masturbated while groping her breast, Ms. Hast said.

Mr. Cheronis, however, said the evidence would show that the women had maintained consensual sexual relationships with Mr. Weinstein long after the alleged assaults.

“If you drown out the noise, you are going to know that what Ms. Hast told you does not hold water,” Mr. Cheronis said, referring to the prosecutor’s opening statement.

Mr. Cheronis showed jurors excerpts from emails to Mr. Weinstein from his two main accusers that he said suggested the sexual encounters had been friendly. For instance, Mr. Cheronis said, the actress from rural Washington who says she was raped in 2013 had suggested in an email that the producer should meet her mother.