Actually, you don't have to, if you start up the game later in the timeline, Fujino's chicken avatar will ask you about how you've been handling the girls so far in the game (Aka choices). If you respond full-on that Kirito has been indulging all of them when asked, you will start with the maximum prurience value possible at that moment of the game you choose to start at, like you had done every single side-event and picked every lewd choice.
Fujino did say 'the weekend at the latest', so technically there has been a non-0 chance every single day since Tuesday until today, growing slighly each day, so fingers crossed maybe?
Like Dgrayman said, this is a 'cheat' that the author added to be able to do this more easily later in the game because a lot of people missed it, but the real way to get more prurience is: EXPLORE. The game has a lot of minor stuff and lore bits/talks that you can miss out all the time because they vanish when you get from point A to point B (hearing rumors about stuff that's happening/the other girls are doing, Sinon's livestreams, etc), you can only find out if you actually try and look around everywhere whenever you have control of Kirito and they progressively increase your perversion/prurience to the point you will always have enough for any choice that pops up in the main story if you do them all (The very first one is the only exception because it's not really a choice, is just there to show you what happens if you don't have enough for a choice, that's all).