In desolate caves throughout Brazil live insects that copulate for days, the female's penetrating erectile organ sticking fast in a reluctant male's genital chamber until he offers a gift of ...

Add Yahoo as a preferred source to see more of our stories on Google. The female penis of the Neotrogla aurora insect species is seen in an undated handout photo released April 17, 2014.

Female on top: A female Neotrogla insect mates with a male in a cave in eastern Brazil. Photo: Yoshikawa et al. In the caves of eastern Brazil, there lives a group of winged insects that mate in a way ...

Neotrogla, a type of insect found in caves in Brazil, has a bizarre mating ritual. The act of reproduction lasts for days, and during the ritual, the female grows a penis-like structure called the ...

Scientists have discovered gender-bending female cave insects with "very impressive" penis-type organs which can have sex for up to 70 hours at a time. Females of the neotrogla species insert their ...