i discovered this on my own, by myself, in my room. after cramming for a test, i was stressed and decided to whap it. i had taken Adderal before studying so i knew itd be a long sess. anyways...the trick is you know that big vein in your cock? you gotta grab the base (right where your sack turns into your cock) of your dick with 2 or 3 fingers on the bottom and your thumb pressing on the vein. more so grab a little towards the side of your dick rather than the middle. just start whappin and watching porn and the pressure on the vein should cause blood to enter and not exit. plus it feels good. be smart about it, if you feel you should let a soften up a little, do so. if youre into this you know your body so pay attention, dont get hurt or anything. remember to grab at the base of your dick, and if youre about to cum, try grabbing your dick as close to the base as possible with your hand and squeezing. dont let the cum out and keep repeating this. its worked well for me. after 4 straights nights of doing this on Adderall my dick was a 1/2 bigger.1/4 of it was permanant. i stopped doing it because i realized my dick is big enough, but for those of you willing, i would really suggest it. and i promise im not bullshitting, the pinched vein increased my girth, grabbign as close to the base of my dick as possible stretched the part of the dick that is up inside of you, and stopping my orgasma right before they started by squeezing the base of my dick made it longer and wider. remember, PAIN IS BAD. dont hurt yourself or strain yourself.