We seem to remember a 3D chess program from our early gaming days in which two characters would have an animated battle when a player captured a piece. In this updated version, "make love not war" is the new rule: "Finally, you can play the unique combination of sex & chess. LoveChess sets you on the chessboard with horny queens and amorous knights." (Insert bad "checkmate" pun here.)

LoveChess: The Ultimate Adult Sex Game (screen shots and ordering information @ lovechess.com)