A series of Hentai games. The stories are pretty random (Find someone's daughter; get pictures for a calendar; illegal street racing; etc. while fucking some beautiful girls along the way).
But you can't just say to them "Let's fuck." You have to flirt them into it, by saying the right things. And the fucking isn't a cutscene either, You get to unlock deeper penetration, sometimes you can even choose where to cum!

A polite term for shoving a lubricated probe into the Earth's hole to release gas.