New Brazilian bugs: Females have a 'penis' for 70-hour mating romp

Four unique insects have been found deep inside Brazil's caves where the female has a 'penis' that she inserts into the male's 'vagina' during their 40 to 70-hour mating session. 

Scientists have discovered four insect species in Brazil that dwell in extremely dry caves, feed on bat guano, and possess what researchers call an ‘evolutionary novelty’. The female has an elaborate, penis-like organ while the male has a vagina-like opening into which a female inserts her 'penis' during mating, which can last 40 to 70 hours, the scientists reported in the journal Current Biology.