What is the test for determining whether a defendant's intent was inferred from the circumstantial evidence?

Intent may be inferred from circumstantial evidence, as intent can seldom be proven by direct evidence. (In re Mariah T. (2008) 159 Cal.App.4th 428, 440.) To determine intent, "[T]he trier of fact looks to all the circumstances, including the act" and "[o]ther relevant factors [such as] defendant's extrajudicial statements [citation], other acts of lewd conduct admitted or charged in the case [citations], [and] the relationship of the parties. . . ." (People v. Martinez, supra, 11 Cal.4th at p. 445.)