Okay let's speak to the topic, the poor guy who asked about the masturbation minigame:
Best advice: don't click anything, go to make yourself a nice cup of tea, or coffee, when she reaches 100, it will end (better than clicking wrong, then she'd start from 0 again). Then, all you need to do, never click "Masturbate" in the game, again. Problem solved. There are other ways to rise lewdness, go to the massage a few times, or edit your save file, set it to 25 (you can't set it higher).
Correct advice: You need to click at the moment she exhales. For which you need to listen to the audio, which I personally find super annoying and not worth my time.