I had this theme with OCD around four years ago. I also had the gronial response thing, dreams, images, guilt and revulsion in my head the whole works. It got to the point where i thought i had feelings for almost every man i saw. However in the end even though my mind was full of OCD thoughts i could see that there is no way, gay or straight you can fancy every single person you come into contact with.
I had CBT sessions along with fluoxetine, and in the end i got better. You will as well.