no. this is simply someone not understanding english idioms and building an offended opinion with that false premise. adult games are about as understandable as adult toys. it is not the same as young adult novels. adult games are not games aimed at adults, but games that only adults are allowed to play.
i did not quite get your points, but the important word is explicit. you can tell any story, but if you tell it in explicit pictures and the story is about sex, that is considered porn. there is no need for explicit visuals. it does not add to the story. it is eye candy. but people like their entertainment with some eye candy. same as they like good audio and gameplay mechanics.
but this is seldom done in mainstream. hence the apparant popularity on an indie site for those games.