Thank you! That's all very useful feedback. I'll pass the bugs along to our programmer Hulusay and I'll work on the design stuff myself. :)
I will note that for 0.5 we changed the way the sex scenes advance (at least for the moment) exactly for the reason you suggested and it's designed at the moment for the scenes to progress immediately one after the other. We need to think a bit about what lust and obedience are going to do exactly, because when I was play testing it myself I found the design more grindy than intended, even once a lot more story, character scenes and events are to be included.
I think either lust or obedience should be used to unlock new sex options, but that leaves the other stat without much to do now, and by pacing it might be better to not use a stat at all but just require that you complete each act twice... it's got me scratching my head a bit.