IMHO, if a developer has to use fragments of real porn videos for some reason, then at least he should take care of a logical, at least to a minimum extent, plot. Normal porn is very easy to find, and in excellent quality (5K), I do not understand what can prevent you from downloading full-fledged clips or movies, not 10-second stumps. But if you decide to make a game - it should be a game, with a meaningful story.