Hack Your Brain with an iPod
Ok, this is seriously trippy. The idea is that you liesten to sounds (obscure frequencies) that resonate with your inner brain. The sounds mean nothing to your conscience self, but your sub-conscience listens and responds.
Hack Your Brain with an iPod - Forever Geek
The software is free for a month and includes basic sounds (for relaxation, self-hypnosis, etc.) and you can buy a whole bunch more including ones of a sexual nature.
I admit, I listened to them a little bit and had a wierd experience with the self-hypnosis one. You can record samples and put them on your ipod and listen to them anytime you want.