As far as love compatibility is concerned, the combination of Sagittarius and Gemini is traditionally considered to be rather exciting! When two people are born under opposite Sun Signs, such as Sagittarius and Gemini, there's often a powerful attraction between them because they're magnetically drawn to qualities and traits in each other which perfectly complement their own.
Each has the ability to compensate for the other's weak points – and in this case Gemini's social skills, tact and adaptability ideally balance Sagittarius's characteristic bluntness and unwillingness to accept restriction. Equally Gemini's cool-headedness and detachment – and tendency to be a bit overly impersonal at times – are nicely offset by Sagittarius's much more passionate and strongly instinctive approach.
Problems arise only if one person tries to convert the other to their own particular way of doing things, in which case the differences between Sagittarius and Gemini can become a major hindrance rather than an asset.
In a long-term relationship, to avoid an ongoing battle of wills, Gemini has to accept it's unlikely ever to be successful in taming Sagittarius's maverick spirit, while warm-hearted Sagittarius has to come to terms with Gemini's take-it-or-leave-it approach.