Spin the Bottle
Surely you won't be surprised by the first game, as it's a classic among classics: all players sit in a circle and place a bottle in the center. The player who spins the bottle must kiss whoever it points to after being spun. Additionally, the pointed player must spin the bottle in the next turn. The duration and 'quality' of the kiss should increase the more often the bottle pairs the same two people.
A simple variation is that the person the bottle points to must remove an article of clothing (it's recommended to agree on a limit to the degree of undress that can be reached this way). If preferred, you can also add the rule that the person the bottom of the bottle points to can reclaim an article of clothing.
The last modification proposed is to play with a full bottle of alcoholic beverage. The players the bottle connects must each take a shot and then kiss. If you're brave enough, you can link this mode of play with the idea of sexy tequila also present in the spicy section of the page.