Finding a donor.
Truth is funnier than fiction. Got this one straight from today's [/r/EverthingScience](http://www.reddit.com/r/EverythingScience/search?q=trickiest%20penis&restrict_sr=on) Smithsonian [article](http://www.smithsonianmag.com/science-nature/trickiest-part-first-successful-penis-transplant-finding-donor-180954639/#jjepM4Ilez1bXcBI.16).
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