After a few sex simulation runs, Naomi no longer gets aroused. No matter what I do, I can't get her arousal above 3%. I've tried multiple positions and skipping to the following days.

Thats an odd issue, i'll look into it. 

The UI scaling option does not appear to be working for the main toolbars during the sex sim - I have a 4K display and it is really tiny.

This has be updated to be a toggle in the version released today.

Also, on my laptop, I've noticed that touch input doesn't work. For some reason, how it's coded isn't allowing my taps to be registered as mouse clicks. It's acting like I'm just hovering. Could you please fix that? I'd like to play with the touchscreen and not just the trackpad.

This is a bug with Unity's new input system, it works fine on android but for some reason it's busted on windows. As a surface user this brings me pain. I don't know when this will be fixed. 

I was also wondering about the graphics. On my laptop, with i7 and Iris HD graphics, the game is super slow and laggy, even with the quality turned to low and resolution at 1080p. On my desktop, i7-10850K and RTX 3080 Ti, my 3080 is running at full blast on medium graphics settings. Will graphics performance improve with time? It's a bit surprising that my laptop can barely handle it and my desktop with 3080 is near its limit.

This might be improved in the latest version, do make sure you're not turning the render scale setting above 1 though. There's some checking that needs to be done with my settings on PC compared to android. Perhaps i'm using something really intense that doesn't need to be.

I'll experiment more with later builds now that most bugs are fixed.