In other species males voluntarily self-amputate a pedipalp prior to mating and thus the mutilation is not driven by sexual cannibalism. This has been hypothesized to be due to an increased fitness advantage of half or full eunuchs. Upon losing a pedipalp males experience a significant decrease in body weight that provides them with enhanced locomotor abilities and endurance, enabling them to better search for a mate and mate-guard after mating. This is referred to as the "gloves-off" theory. Males and females have also been seen with the roles reversed in terms of genital mutilation. In "Cyclosa argenteoalba," males mutilate female spider's genitals by detaching the female's scape, making it impossible for another male to mate with them.