Sounds scam-ish but I'd like to know more details; I could be wrong but I'm pretty sure there is more to it than just "pure blood", like perhaps a different therapy similar to PRP to make it practical for filler (or growth factor) use.
If you want actual gains, get a proper filler with a proven track record; I can't imagine why one would take a silly gamble when
HA, Fat,
Ellanse,
Radiesse,
Renuva, and
PMMA are on the market! If your friend is comfortable talking penis enlargement, then show him this website. I would like to know more about the procedure he's talking about, because if it is a scam, I'd like my readers to know.