It sounds like you mean hard-core serial porn. On paper it sounds great, I'd like it, but as mentioned by the others, acting ability would be important. The characters would need to be relatable and real for it to be taken seriously and viewed as a turn-on. In regular porn, the worst acting seems to be in the beginning of the scene when the context is being set, as soon as the sex starts it gets more natural. It costs less to hire actors that can't act and minimize their opportunities for speaking except for sex talk.