Well acctualy I should admit that this happend to me. You see I too was raped by my girlfriend and "blackmailed" by her because I got so drunk I didn't notice her setting up the camera or even posing me in bed to get the most filthy angles, nor did I notice her spending half the night using a video editing program and then burning two disks.
Afterwards she threatened to show my current gf the video, this of course was unacceptable to me, but instead of telling the truth to my girlfriend that I was raped I decided to have sex with her again and thus incriminate myself further in a cunning double bluff.
This knocked her off guard and then I went to her house to have sex with her once more, but this time I asked if she would wear the two cds she made on her nipples as I enjoy this kind of thing. She obliged and then I removed the cds with my tongue and made a run for it and got the bus home in the nude where I was arrested and the disks destroyed for public indecency.
In all it was a good week and now I just have to recover the tapes my current gf made of me wearing women's panties which she is using to force me to have sex with HER. Its a tough life. Hope this helps you op.