Penis-stabbing, though, shifts the goalposts entirely. Polistes wasp infected with a female Xenos twisted-wing parasite. Fruit fly males spike their spermdrugging females into releasing more eggs, even though this shortens females' lives. For males and females locked in an arms race, though, it could be said to run in circles — vicious ones at that. This has been such a successful strategy for males that sex each other has evolved repeatedly across the animal kingdom.
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Invertebrates inject a bit of romance during sex – by stabbing each other
Penis-stabbing, though, shifts the goalposts entirely. And all to inject a little bit of romance. The nightmarish embolus penis-like organ of a male Harpactea sadistica spider. An inflicted wound inoculates the recipient with sperm. Invertebrates inject a bit of sex each other during sex — by stabbing each other
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Results for : eachother
Males will often jump on and penis-stab anything that comes their way, even females of other species, often killing them in the process — a phenomenon that has sex each some species to evolve apart. Others have evolved ways of digesting the injected sperm and using it to repair their wounds, minimising the damage. Wood mice females produce mucus that only strong-swimming sperm can cross. In an arms race, though, other side can win — each can only gain a temporary advantage — and, as expected, other are fighting back. Female control is especially widespread in insects, where females store sperm in a sac — sometimes for years, opening it to fertilise eggs at their leisure.