On my second playthrough. I'm avoiding Matt like the plague (slapped him on the first day), but I'm having trouble finding ways to increase my corruption score enough to give Damian a handy in the theater (I assume that's related to the corruption stat). The one thing Matt was great for was increasing my corruption stat, but he is way too much of an asshole for me to put up with. And it seems to be pretty much impossible to break things off with him if you do anything at all with him in the early game. There are even a few scenes where I have absolutely no input to make my character turn him down, all I can do is to keep yelling "STAHP!" at my screen.
I did try to cheat by increasing my corruption stat manually by seeing if I could edit my save file (opened the save file in WinRAR, and opened the log file in Notepad++), but it looks like the corruption value is set by adding up several variables* that I may or may not be able to access through the save file (I didn't scan ALL 22,044 lines), but it looks like there are lots of characters in the file that Notepad++ doesn't recognize so unsurprisingly any changes I make and try to package into a new save file end up resulting in a corrupted save file anyway. Alas I am relatively new to the elegant art of bashing my games open with a sledgehammer and clawing through their innards like a hungry vulture. TLDR: Cheating didn't work either.
*It looks like the way you are doing it is by adding each event which either increases or decreases corruption to a data structure (linked list?) and then tallying up all of their values to pass to a corruption variable. Is that about right?