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For anyone genuinly interested that doesn't know what's happening: this is actually the way some animals reproduce. This happens because the male wants to pass his genes to the next generation. The female, in order to choose wich genes are the best for the species, stores the sperm of different males inside her body prioritizing the sperm of the most attractive males(not in a physycal way necessarly, I hope you get that :)). This is wyh some male species have evolved to sting the female in order to bypass the system of selection the female has. The females, have then evolved to have another system that filters the sperm of the males in their belly. wich is the usual place the male stings. This is calle the evolutionary tango of animal genitalia.