Anomaly Vault is a real diamond in the rough. I've played several iterations of this game as it has developed, and although I was initially unimpressed with its bare-bones presentation and the lack of any real "play", it's managed to maintain my interest, and my opinion of it has only improved over time. Despite its simple design, I think this is one of the better HTML games on this site.
Your character works in a shadowy organization that investigates objects with strange erotic powers (essentially, the horny SCP), and he finds a bracelet that, when worn, causes him to be actively ignored by people. This artifact, when used with some of the objects in the Anomaly Vault, leads to sex-related shenanigans. Each in-game day is split into three time segments, and time passes whenever you research an object (either by studying it in the lab or taking it out in the world). Although time passes in-game, there's no overarching plot or real urgency, so you're free to investigate whichever objects interest you.
The game's simple premise allows for a diverse number of fetishes to be incorporated smoothly without interfering with each other, and the devs update regularly with a large volume of well-written material. The scenes are fairly diverse not only in fetishes but also in writing style, and for the most part the game clearly telegraphs the content associated with each object. It also allows for a number of cosmetic alterations that are all justified in-universe, which is the kind of extra effort that is always praiseworthy.
The only real "gameplay" consists of trying to find all the events for whatever objects you're interested in and is otherwise just a delivery vehicle for porn, so if you're looking for something more involved, this is not the game for you. Nearly all the sex scenes consist either of some form of mind control or submissive player-character transformation transformation, so people bothered by those themes should also look elsewhere. However, if not, I'd recommend giving Anomaly Vault a shot. It knows exactly what it wants to be and executes its goal with a thoroughness and clarity of vision that is often lacking in adult games.