Males do not target outgroup females because females are contested resources, not competitors

Evidence

A second issue yet to be clarified within the context of intergroup conflict is why males, as the primary agents of intergroup aggression, do not target out-group females as well as out-group males. The logic of sexual selection suggests that males do not view females as competitors, but rather as contested resources. This is true for both in-group and out-group females, as it is often the case that females from the out-group are incorporated into the victorious group after intergroup conflict (Thornhill & Palmer, 2000; Wrangham & Peterson, 1996). — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 1190

Categorization

• XREF: Complicates a purely generic ingroup/outgroup antagonism account: the psychology of prejudice discriminates by sex of target as well as group membership.
• corroborated: 2 independent passages support this claim — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 1190