Per the BBC:
http://www.bbc.com/news/science-environment-27056809

"Female insects with "penises" have been discovered in Brazil - the first example of an animal with sex-reversed genitalia, scientists say.

Neotrogla females insert the erectile organs into males' vagina-like openings.

The elaborate structure, dubbed a "gynosome", is used to suck out sperm and nutritious seminal fluids.

Copulation lasts an impressive 40-70 hours, the researchers report in Current Biology.

"Although sex-role reversal has been identified in several different animals, Neotrogla is the only example in which the intromittent organ is also reversed," said lead author Kazunori Yoshizawa from Hokkaido University in Japan.

…"