From Tumblr...Lel
My gosh... I'm pretty sure that's a prosthetic, but man, I sure wish it wasn't. I'm not sure the human body could support such a fantastic monster.
If only...
I have watch all of the star trek episode and not once have they ever augment the penis to pass off as one of the species in disguise when they go off world incognito. Seem like they would be capable to do so, but maybe violate the prime directive?