I just finished
Gran Ende Saga, which has been mentioned a couple pages back.
Quick pros and cons:
Pros:
- Full control over sex scenes, so you can go anal-only with all the female party members, wich is reflected in each one's status page
- Sex scenes change depending on if it's the first time the girl is doing something, if she has some experience and if her affection for you is really high
Cons:
- Sex scenes are entirely disconnected from the rest of the game, as they only happen when staying at inns or at your home
- Anal-only seems to block access to a lot of the sex scenes at the player home, most notably the bath scenes
Overall I'd still recommend playing it, but be aware that it's closer to a regular RPG with optional sex scenes rather than a full sex RPG.