Gemini's mental energy and Cancer's emotional energy actually balance one another quite well. The Crab needs to remember not to be so sensitive to the Twin's natural wit. These two know how to have fun together. Fire and air make for roaring passion, but the Twins may feel stifled by being the Lion's only subject. Lots of verbal exchanges here, but Virgo's seriousness could rub Gemini the wrong way.
Sexual sparks do fly, though.
Great for short-tem passion. Libra's can't make a decision, and Gemini's have a hard time sticking to one. They may end up nowhere fast. The passion is there, but the Scorpio can be too probing for Gemini's long-term comfort zone. Stimulating - both mentally and physically.