Just thought I'd ad my 2 cents.. I begin by finding what a sub is accustomed to as far as frequency of orgasm, and how strong their sex drive is. The key is to make it fun, not annoying. Then try to maybe push the limit a bit, until you find a denial time that's enjoyable. I so love to have a sub right on the edge, willing to be there for my pleasure and begging to cum. I'm actually more sadistic in orgasm control as opposed to inflicting pain. However I do love to tease while giving a good spanking.

PS - West Side Academy is also open to enrollment

http://www.bdsmlibrary.com/forums/showthread.php?t=3981