Feminist Frequency’s excellent Tropes vs Women in Video Games has a new installment on the prevailing ways that characters’ butts are presented in games: with female characters, they’re emphasized, centered and revealed; with male characters, it’s often literally impossible to see their butts.
As host Anita Sarkeesian points out, this makes for bad art. A character that’s being objectified as a sex object is harder to empathize and identify with, meaning that the perils and triumphs of that character mean less to the player.