What is the standard for a jury to consider the credibility of the evidence in a sexual assault case?

In United States v. Singh, 628 F.2d 758 (2 Cir.), cert. denied, 449 U.S. 1034 (1980), we elaborated on this standard: "(T)he evidence must be viewed in the light most favorable to the opposing party, crediting all available inferences in favor of the opposing party.... Furthermore, all issues of credibility must be considered questions solely within the jury's province." Id. at 766 (emphasis added).