Marble Maid

Yes this is an actual game and pretty good one at that. Unlike most hentai games it's neither an rpg or a visual novel. It heavily reminds me of super monkey ball. You control a maid in a ball looking to clean all the dust bunnies in every level. Some dust bunnies can be very hidden and their are even hidden levels accessed by finding a secret in certain levels. At the end of each world there's also a boss fight, which gets kinda repetitive in the later worlds, since it the same boss fight just with a different stage layout. Each world has a unique theme that all makes sense for a maid doing cleaning. Also Worlds and the hentai aspect are accessed through a hub world which while small is a nice touch. As for the hentai aspect, it's just photos you unlock for collecting a certain number of dust bunnies or beating the boss which you get a photo each time you beat the boss. If you're just looking to get off with little gameplay, this isn't for you. However if you're looking for a good game with hentai on the side, this is perfect for you.