Terrible puns - needless details of insect life ahead

[dionysus1999]

Butterflies have photoreceptors in their penises that guide mating behavior (leading to the phenomenon termed "hindsight")

From:  http://feeds.boingboing.net/~r/boingboing/iBag/~3/HYUEfAUfVes/headless-flies-respo.html