Managing photos?

Hi folks. I'm not sure how many people will see this blog. I have an issue that i need to solve.
With all the pics i have downloaded (mainly from this site), i have run into a problem trying to manage them all.
At this stage i have 29 different categories...most have numerous sub-categories.
Example: Playing-Pussy-Blonde-35+-Bedroom.
Any suggestions on how to simplify my filing system to stop confusion?
I have nearly 7000 images saved so it's not going to be easy!
Suggestions please.
Cheers.