Cool. The whispers didn't do it for me, but I got slightly aroused lol. But yeah, I've had "brain orgasms" many times before. It's usually while listening to awesome music (lights turned off, eyes closed, etc. in an attempt to totally immerse myself in the sounds), but I've also felt it while thinking (though it's much rarer, and is perhaps mixed with euphoria due to my sometimes megalomaniac thoughts). The whole nervous system seems to get hyper sensitive, it's awesome. It's so awesome, in fact, that to this day I still remember the first time I felt it, lol, a few years ago.
I couldn't "brain orgasm" with the whispers, though. It was too boring and eventually I just stopped trying (yes, this is something you actually try and do: By focusing all your attention in the sounds, closing your eyes and hoping for the best, basically. That's how it works for me, at any rate).
I guess I could share what I believe will get you a "brain orgasm" more easily than dull whispers:
http://www.youtube.com/watch?v=wQ3bJN1zLKw
Around the 2:40 mins mark starts the "brain orgasm" section, but to maximize the chances of feeling it you must listen everything from the beginning, with good headphones, with your eyes closed (and if possible in a room with no sunlight). First or second time I heard this, I couldn't hold my jaw in place, lol: my mouth just opened. Be sure to click the HD button on the player to listen the sound in higher quality (only 128 kbps if I remember correctly, but it's still better than nothing).