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You can use the cheat sheet to gain exp indirectly as well. You just use the money to buy multiple copies of Skill manuals on Saturday in the Brothel on the 2nd floor. Consuming a skill book you already know gives exp instead. So you can get any amount of exp this way as well (except Sex Exp).

I might expand the Cheat Sheet in the future, but at the moment I think it covers pretty much everything except maybe gaining any item you choose, but that sort of thing would be kind of hard to implement.