The file "SEX.SAV" controls which pictures show up
in the photoshop. Use a binary file editor to modify
it. By changing byte $00 through $55 to the value $01,
and also byte $1A to $1A, byte $38 to $1D, and byte $56
to $1E, all pictures are made available in the photoshop.
These are presumably all the sexy scenes in the game.