i've actually been a dom to a woman twice. My torture of choice - forced orgasms. i tied her down to the bed, secured a magic wand vibrator to her, and watched the magic happen. The first orgasm I drew out for a long time; letting her get close, then turning down the power on the vibrator, turning the power back up when she had calmed down a little. After a few times, she was begging with tears in her eys to cum. But after her first orgasm, it was non-stop full power on the vibrator until she pleaded with me to stop- but I wouldn't let her until she gave me 3 more orgasms. The last orgasm, I loosened one of her hands (it was velcro restraints) and left her on the bed with the vibrator going full power - with instructions to call me on my cell phone while she was having her final orgasm. It made the drive home most enjoyable.
Of course, the second time, I had to raise the stakes some...