Andy:

You've already been on the sets of the best gay porn studios. I don't think there is anything else you could learn from a porn shoot with girls.

If you're looking to learn "professional" production techniques, look into volunteering with independant NON-porn shoots. Craig's List is full of volunteer opportunities to work with some brilliant student and indie film makers.

I gotta warn you though, if you hook up with a "bigger" indie production, you'll be spending a LOT of time just standing around. You might learn some lighting techniques - tricks that always require more time, equipment, manpower and effort than you'll ever use on a low budget bear shoot.

Most of what you'll be learning is how to load and unload a truck.