Hah! When I first started searching online for foreskin-focused porn, I found lots of gay content but almost no straight stuff. What I did find was always incidental - it just happened to be in the pics or video.
Whereas in a lot of the gay content it was explicit - eg it was specifically mentioned in the description/review. There were even entire videos/DVDs devoted to it. "Foreskin Island" is one title I remember.
And then I found this little Yahoo group which became the seed for this forum. Happy days!