The first air sign, Gemini is probably the most sexually playful sign of the zodiac. His planet, Mercury, delights in communication and loves confusing people. In ancient times Mercury, or (in Greek) Hermes, was associated with a trickster personality. Today we can see that the Gemini twins love to play games, especially when they involve sex. Gemini's dual nature means that he can easily shift roles and enter into whatever sexual fantasies you or he might like to spin.