Research has shown, for example, that a species of female harvestmen (as daddy longlegs are also called) will perform fellatio to avoid potential violence from males. In another species, meanwhile, males secrete an apparently extremely tasty substance on their penis that entices female mates. In general, harvestman sex works like this: Males initiate mating by using their pedipalps—leglike appendages near the mouth—to grab females’ second pair of legs. But what came next really triggered a double take: males showed significant aggression towards reticent females, biting their legs and bodies, sometimes leading to fractures and death—four females were cannibalized. A female Leiobunum limbatum consuming liquid from a sac next to the male's penis.