Stricttly speaking, in porn there can only ever be interruptions, not cliffhangers. Sex is a known script which only knows one direction, escalation of practices, attitudes, corruption etc. A porn story is one big movement in one direction and it can only be interrupted, stopped, delayed etc. (even reversion is not possible you can't go back on sex, once it happened). As a narrative device interruption can only have the function of a tease, not of a suspense. Suspense requires an open question: what could happen? Interruption doesn't drive curisosity, but denial and frustration which is only arousing up to a certain degree and demands release. Generally people don't want to be interrupted during sex or watching sex (or it's a fetish). Therefore it gets annoying very fast. So it has to be used cautiously by devs. Sometimes I think they take porn to seriously in this sense - thinking it is a detective or mysery novel or a soap opera, and not seriously enough in another sense - you deal with people who want to see something, not to guess or just to be entertained. I don't get curious from the question oh, is she giving him anal now or in a week? That's not curiosity which is triggered here but expectation: when are we getting that and are we getting that at all? It's a matter of if and when, not an intriguing mystery.
So the aim for a dev with his update endings, I think, should be: generating expectations, not constructing cliffhangers like in other genres. Porn can be it's own narrative genre and shouldn't borrow techniques too much.
If "Psycho" would be a porn movie, there would be no suspense in Hitchcock's sense. It would not be possible nor would it be necessary. You would know from the get go that Bates is going to fuck her. But in order to be a good porn movie everything would depend on rythm, building up (and partly disappointing) expectations, generating plausibility, showing more and less etc.
