Condoms reduce the risk of some things, although te be really effective they have to be the thick kind like the military hands out - not the thin ones hawked at walmart. Thin condoms have pores large enough for a virus to slip through, although they will stop bacteria. HPV, Herpes, Staph infections (like MRSA) and such will still be transfered just from the sweaty contact of other body parts.
I think if bareback porn were made entirely illegal then the profit margine on it would go up and production would move overseas (at least until fifteen years from now, by which time home equipment will be equal to todays professional video equipment and young couples will likely flood the internet with free exhibitionism).
Some Things are not problems to be solved, rather, they are facts which must be coped with over time.