sentences:  In some cases, sexual cannibalism may characterize an extreme form of male monogamy, in which the male sacrifices itself to the female.Males may gain reproductive success from being cannibalized by either providing nutrients to the female (indirectly to the offspring), or through enhancing the probability that their sperm is used to fertilize the female's eggs.Although sexual cannibalism is fairly common in spiders, male self-sacrifice has only been reported in six genera of araneoid spiders.