I'm not familiar enough with stories here to judge, but I can see that 'cheating' is when you quite literally do cheat on your spouse - by lying to them or concealing something, which is, surely, the very essence of cheating? I wouldn't presume to judge it morally - and ony partly because I have been guilty* of it, but it is surely almost by defintion cheaing?
(*guilt being of course an outcome of moral self-judgement..?)
As to 'sluts', I haven't seen that here (but I haven't read much yet..) but have elsewhere - and I do find it ... well, disturbing.... the implication that simply by having a high sex drive, or even a vivid sexual imagination, I (taking it personally..) am somehow then degraded, contemptuous...
Slightly tangentially, though, I do admit that guilt and shame, for me, do enhance the intensity of sexual feelng: but they don't really, in rea life - the ony time I felt real shame at someting sexual was when I had an actual full-blown affair, and the shame then was at the lies I told, the deceits I engaged in, the 'cheating' I did... so the sexually arousing 'shame' and 'guilt' for me, are sort of fake - virtual, if you like - part of a fantasy where I am indeed somene who feel shame, guilt, reluctance..
God, this is complex....