Lmao,
It might sound weird, but i have a folder on my main computer with most of the girls that i have smashed. Each girl has a sub-folder, and inside, their pictures. Regular and naughty pictures...
And if i suddenly remember of a girl that i smashed, i just look for her pictures on social media, create a new sub-folder, and add her pictures...Voilà
If i don't remember the name, i create the sub-folder, with the name of the place that i met her, or some situation that i only relate to her...Something like that.