In determining the sufficiency of the evidence in a sexual assault case, what is the test for determining sufficiency?

In determining the sufficiency of the evidence, we ask "`whether, after viewing the evidence in the light most favorable to the prosecution, any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.' [Citation.]" (People v. Hatch (2000) 22 Cal.4th 260, 272, italics omitted.) We resolve neither credibility issues nor evidentiary conflicts; we look for substantial evidence. (People v. Ochoa (1993) 6 Cal.4th 1199, 1206.)