Some of these exist right now, but fairly rarely as far as I can tell (an early example being when you penetrate a slime girl)
From what I know, Thresh wants to finish thr core game first before adding on things like that. Not to mention the methods they use to render models won't work very well with animation. Look in the folder for Kotone, she has a hundred or so individual layers for various expressions. You'd need to copy every one for animated frames, or change the framework.