You are doing something wrong. It absolutely works, because I tweaked every stat in this game numerous times (sometimes even raising nrg and girl's arousal multiple times in same scene, just to see if there was any bonus for them having more than 2 orgasms).
In this game, it is rather a mess. The same stat appears many times, and you need to change the relevant instance for it to change in game (changing nrg from the previous day, does nothing i.e.). The money, and PC stats, are located right after the first empty line. The nrg/orgasm values are always at the very bottom, if you are in a sex scene during the save. Relationship stats, for each NPC are easily located - as all characters are located in the same middle-portion, and clearly labeled. Other values, such as inventory items, are harder to locate, but everything is there if you feel you need it. If you have unlimited cash - which is easy - there is no reason not to just buy everything in game, however.
Every game is arranged differently, and takes some effort to figure out, but it always works.