I could add "even harder" girls but it's not easy to balance with the current 0-100 stat system and I might have to add some extra barriers/gates in order to do that, maybe something that is unlocked with exp or money.
In any case I would have to add an extra layer or something that might be difficult to handle.
One of the easiest Ideas would be like... buying a car for lots of money and exp, that allows you to visit zonez that are a bit more far away, but any girl there would still have to depend on your existing stats(unless i make new ones, which I don't like at all) that at that point would be close to 100 anyway.
I know you're not keen on more skills, but as you point out, there's only limited milage you can make from locking things behind what you can afford to buy. When you developed Ms. Bloom you had to add a tracker for culture focus. Perhaps I can make a case for new skills. It could fit in with the suggestions about sports / activity related content.
Girls might only go for you if you are succeeding in their favourite activity. Right now we have stamina and strength, but no stats around different skills or physique.
It could be possible to create a system where the harder you push toward having a bodybuilder's physique the more you drift away from being perfect for swimming or running. So doing a run where you are aiming for a threesome with two of them might require a lot of planning to be acceptable for both partners simultaneously.
Or if that's annoying, a series of skills that require daily attention and will decay if not used and there's not enough time to do them all so you have to proritise.
Simpler still, taking journeys to more distant activities will eat time unless you buy better transport in the same way that visiting Jane etc is a trade off between walking and taking a bus, but once bought you could be building up skill and rapport with dancers, actors, chess geeks, working as a delivery driver or construction at the weekend, whatever you can find content for. Or just more subjects to take at school. Anything that can have its own skill meter so you don't just burn through all the content in one go.
