Eroge

Sexy visual novels. Usually referred to as "H-games" on OT.

Eroge can cover a wide range of genres. There are side-scrolling shooter eroge, traditional RPG eroge, even bullet-hell eroge. Most of them usually follow a scripted storyline, with a serious of (painfully obvious) branched paths at set intervals.

For example, if the choice given to you is: Who do I want to hang out with?

-Risa

-Misa

-Kisa

-Frieza!?

What the game is really asking is:

Who do I eventually want to have sex with? (Protip: don't pick Frieza)