Hiya,
I think you mean "edging" :
"Coming nearly close to climax or ejaculation,then purposefully stopping sexual stimulation in order to delay the same, so that the ultimate climax will be more intense". You can do this over and again as long as you can last out it does make the orgasm very strong.
Regarding your other question try googling "URDX", pretty much something for everybody there.
Have fun
M4S