Professor James said:
Well, kind of the whole point of porn is for sexual arousal and satisfaction. Do you mean movies that have explicit sex scenes but actually have a well written plot and production values and all that.
Well, I have no alternative but to spell it out.
I sometimes share with certain people those great things invented by the Japanese which are static (not a film, although those do exist), are explicit, 75% not very well written, and in about 50% of the cases production values are almost non-existent but it ends up looking great anyway.
I usually only share "standalone" drawings and not pages and pages of the stuff, so the plot is never a factor.
Although, the Japanese also kinda have what you mentioned. "Pink movies". Adult content has to be censored, so instead of featuring full-fledged sex scenes with pixelated genitalia, they use "smarter" ways like candles or other objects in the right position so it doesn't break the "immersion". Those films have plots and production values must fluctuate, I guess (haven't watched those).