Nice! 
This idea is far from new. Andy Warhole used similar additives and he may well not have been the first. I can't say that I've researched the subject, but he's the earliest I can recall at the moment. There have been numerous artists since, including some very well-known names.
But this bloke does seem to be sincere, serious and successful, so good for him. As for the aesthetics, no, I personally wouldn't want (somebody else's) sperm hanging on my sitting room wall, but hey, it takes all sorts. 
ps - I, too, was hoping for some free photo paper - great subject line.