I started doing HGH 6 days ago for the first time and didn't tell my girl friend. after we had sex last night she said wtf? Your penis is way bigger all of a sudden. She was so supprised she kept asking me over and over what I had done. I said nothing over and over but she was so adiment that it could not have just been a good night of sex. She said something had to have changed. I've been on test For a while and said maybe it was increased blood flow but she said no. Said it wasn't just harder but it was large without a doubt. anyone ever expirences increased penis size from HGH? Is it permanent? I never actually expected this to happen and never planed on telling anyone but she just knew. She also knows nothing about AAS and had never heard of HGH.