i tried it a little. i seemed to have better luck with the bottom edge of my palm (kinda lie a karate chop) than with my fingers. obviously we arent chopping anything. I cant find it again, someone on here perfected the technique of using a slightly deflated football to do it. I believe they set it on a hard chair, not a couch or lazyboy, then he would sit on the football and on the chair backwards....lean back and kegel blood into the crank.....then slowly lean forward until the pressure was quite a bit.
I'll keep searching for it! the thread was named something like "get huge before sex"....not sure how i found it or why i cant now.