Warm Coffee

"Have a successful date with a girlfriend to get invited into her house."

- In-game description

Warm Coffee is an achievement/trophy in Grand Theft Auto IV.

Acquisition
This can be done with all girlfriends except Kate. The easiest one to get this achievement with is Michelle, as she usually refuses to invite Niko on the first date.

Trivia

 * The achievement's name is a reference to the Hot Coffee Modification debacle that occurred following the release of Grand Theft Auto: San Andreas where the player could play a sex simulation upon being invited into a girlfriend's house for "hot coffee".
 * In The Ballad of Gay Tony, it is possible to achieve this trophy via a Booty Call as well.