<p>Polyandry is the most common mating system in elasmobranchs and usually results in multiple paternity (MP). In recent years, an effort has been made to understand the adaptive significance of polyandry in sharks and elucidate the sexual selection mechanisms of this system. This effort has revealed an evolutionary arms race in reproductive tactics between sexes promoting cryptic sexual selection in males and females. Females have traditionally been portrayed as passive competitors due to the coercive mating strategies of males. However, this idea inherently underestimates female sexual selection strategies that occur after mating. <i>Mustelus henlei</i> is a placental viviparous species that exhibits geographic variation in its MP frequency and skewed male reproductive success to varying degrees. We evaluated female cryptic postcopulatory selection (FCPS) processes, such as differential ovulation and controlled embryo nutrition, in <i>M. henlei</i> litters (<i>N</i> = 12). We collected complete uteri from pregnant females to assess paternity using the position of each embryo as a proxy of differential ovulation and evaluated the condition factor as a proxy of controlled fetal nutrition. The MP frequency was estimated to be 66.7–75% using seven microsatellite loci. Significant differences were detected in the condition factor of embryos based on paternity; however, there were no significant differences in embryo position. These results suggest that controlled nutrition is a possible female sexual selection mechanism that is promoted by placentotrophy in <i>M. henlei</i>. This study is the first to evaluate FCPS in <i>M. henlei</i> and highlights the potential of females to influence offspring quality in elasmobranchs.</p>