"This species has two penises, which it uses to fence, in an attempt to inject sperm into its opponent in order to fertilize it, while avoiding being fertilized itself(...)"
(https://en.wikipedia.org/wiki/Pseudobiceros_bedfordi)
(https://en.wikipedia.org/wiki/Penis_fencing)
Somebody needs to draw a comic featuring yukkuri engaged in peni-peni fencing, it simply has to be done.
This is too absurd for there not to be a picture of this.
Updated by Skribulous