I gotta say, in my opinion, this statement is misplaced.
I already wrote this in my review, but up until EP17 this game was very clearly designed to get it on with every single character available.
I don't know if this was patched since then (since I didn't play again), but remember the first scene in EP17? The discussion about what happened in Jolinas Bedroom? That happened regardless of wheter or not you actually went with her into that bedroom. The dev WANTED you to play around with her. The Nerd-Girl gave you her blessing, even pushed you to do it, as you would expect from a harem game.
If you play without a harem in mind, this game is frankly boring and lacks the appeal to play it multiple times every time a new patch comes out... the days just fly by with barely any content, unless you go for all the girls simultaniously. Are there ANY Events or scenes in this game you don't get to see, unless you limit yourself to a specific character? Not that I know of. So why should anyone excercise "self-control or discipline" in the first place???