Strange, I've never came to the maid - I always find her to be a welcome break after the Endurace round. If you get desperate for stuff like this I can only recommend the following (I'm the guy beat it two days ago but ended up unable to cum on the round at the end where you're supposed to):
1.Stick exactly to the beat, if you differ from it then you'll probably lose (unless you cheat and stop fapping).
2. Stroke lightly, the game doesn't really tell you how hard to stroke and since the challenge is to not cum - it only makes scene to give yourself the advantage (in my own experience, trying to fap with a stroke-hardness proportional to the strength of the beat leads to the rhythm being almost impossible to keep and if you should somehow keep it, you'll lose in an early round).
3. There's no "no talking" rule - I got through the last two rounds by sticking to all the rules and commenting on the rate and quality of the censorship of what was shown. To be honest that might have killed the fun, but it worked. It's too sad that it lead to my shouting "I'VE FUCKING WON" throughout the start of the round where you're allowed to cum, even once I stopped talking and playing normally (which was just about after the first and only break the round gives you), I still couldn't cum until the game ended and I fapped like mad to some low-quality hentai (surprisingly, the orgasm wasn't even anything special).