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Calopteryx maculata

Male black-winged damselflies, like other insects, scour out the reproductive tracts of their mates during reproduction to remove her former mate's sperm. This act insures that the female's offspring will be more likely to be his and his sperm will not have been wasted. Male black-winged damselflies are equipped with an inflatable, balloon-like, bulb headed penis. Down its sides are long bristlesand a pair of horns at the tip. The bottlebrush-like genitalia is perfectly suited to inseminate the female and remove the sperm of previous males. Source: Fluctuating Asymmetry, Sexual Selection, and Survivorship in Male Dark-Winged Damselflies. Beck, Michelle L.1
Pruett-Jones, Stephen
Ethology; Sep 2002,Vol. 108 Issue 9, p779, 13

Photo Courtesy of: http://campus.greenmtn.edu/dept/NS/Dragonfly/calopteryx_maculata.htm