If you say so~
When you level the girls to a certain point and you get caught having smexy times in public, Xavier will call you to his office. With each girl, you can command them to activate their "plan", which afterwards allows you to do anything sexual in public. For Rogue, you don't need anything specific, for Kitty you need Xavier's photo in his room which you need to get at night (also you need to save-scum since the chance is completely random), and I'm pretty sure you need the photo for Emma too.
I think there's an unofficial one, but anyone can correct me if I'm wrong. I probably am, since I almost never play Ren'Py games on Android since they can be kinda finnicky.