Hold W+P, and press N for 5Q willpower. Keep pressing it for 5Q each. Caps Lock has no effect. Yes, I have checked. The Skip Button charges a certain amount extra, depending on how many levels you're trying to skip. The early levels aren't really a problem here: it's the later levels that really cut into your WP. Almost all of the girls start needing NONs, after a few thousand levels. By Lv 10,000, only Helen and Sally are still in the Qs. By 20K, only Helen. Helen is easily the cheapest girl in the game overall. Her initial cost starts out higher than some of the early Campus girls, but at Lv. 50K, when everyone else costs several NON per level, she's still costing a bit less than 200Q per level. I literally had to download an Auto Clicker program to make up the time difference in leveling girls up. Also, I recently discovered that earning Loyalty from Campus, City and Countryside can also earn you a crapton of Pearls.
The first 200 levels net you 1 Pearl every 20 levels. From there to 300, it increases to 1 per 10 levels. For each hundred after that, the overall Pearl gain increases by 4.
In the Countryside alone, I've earned about 36,000 Pearls I have yet to redeem. This is because I'm now earning 14+ Pearls per level. Pearl gain seems to be equal in all regions, so start with the Campus. The only reason I use the Country is because you gain enormous amounts of WP there, so it's not difficult to upgrade Click Power & empty the girl's WP gauges.