All XXX games are overrated.
3dsexvilla & similar games
These get old & boring very quick, all you can do in these kind of games is change the clothes, toys and move your mouse up and down.
Hentai interactive stories/dating sims
These contain a lot of text. This wouldn't be a bad thing if the stories told in these games were interesting, but once you've played one ofthese games, you've played them all. Besides containing a lot of text, the sex scenes pop up at the most illogical & improbable moments.
Example : A girl falls of the stairs and hurts her leg. your way of helping her is by proving that nothing is wrong with the leg by placing it over your shoulder. Since you don't know which leg hurts, you place them both over your shoulder and after you do that you just happen to notice the white panties she's wearing. You can probably guess what happens next.
Adult orientated adventure games
Think of Larry and Leather goddesses of Phobos. IF these games have a good story, then it's often not very explicit (meaning, you should be glad if you see a nipple). Sadly, most of the time the story sucks and you still don't get to see anything.
Games like strip poker, sextris, etc
The goal of these games is to win, so that you can see a picture, which you can just as easily find here on freeones. If you decide to look on freeones it probably takes you less time & trouble.
Mods for games like Baldur's gate & oblivion
These usually aren't XXX, but some of these (certainly not all) actually make some sense, so if I were you, I'd go for these.