Bachelor Party is an adult-themed video game for the Atari 2600 developed by Mystique.
The game is a simplified version of Breakout where the "ball" is made to look like a nude man and the "bricks" are made to look like nude women and the man bounces back and forth horizontally rather than vertically. On the left, he is repelled by a woman with whom he collides and subsequently eliminates from play, or by the opposing wall. On the right, a vertical platform (said to be "Spanish Fly" in the manual) returns the depleted bachelor to the room full of women. The right platform is controlled by the player using a paddle controller.
The premise is that of a bachelor having his final fling with a room full of inexplicably nude women. The equally unclothed bachelor is propelled repeatedly into the room of women by a "Spanish Fly" used as the player's paddle. When entering the fray, the bachelor's exaggerated and pixelated penis is seen to be erect. When he returns from having collided with (and presumably "scored" with) a woman or after hitting the opposing wall, his penis sags. It returns to erect when the bachelor is successfully set moving again toward the left.
A second version of the game, titled Bachelorette Party, also exists. It has no difference in gameplay, but has the game sprites reversed: The player now uses his or her paddle to bounce a naked woman toward naked men.