Libra is one of the strongest compatible signs with Gemini. The two of them love to have heart-to-heart conversations, make each other laugh, and almost always have a good time together. Neither is fantastic at making decisions and tend to procrastinate, but Libra will feel guilty about not finishing something, while Gemini will push it out of their mind.
Long-term Relationships and Marriage: Geminis have a harder time with commitment, and Libra might not be interested in a more open relationship, so that is where there could be conflict.
But if Libra can keep Gemini intrigued and on their toes, and if there is mutual respect, there is no reason they couldn’t have a long-lasting relationship or even marriage.
Gemini and Scorpio
But this actually makes them very attractive to each other. Geminis are fairly open about who they are, while Scorpio tends to be more mysterious.
Scorpio is a deep water sign, while Gemini is more focused on the exciting parts of sex. The only way to have sexual compatibility is if they have known each other for a while beforehand, and if they learn what they are lacking from each other.
Long-term Relationships and Marriage: Gemini likes to leave their options open, whereas when Scorpio gets attached 
there is very little that can disengage them.
Scorpio can also be a little too emotional for Gemini’s liking, and Gemini’s permissiveness may cause some friction and have an adverse effect on a relationship.
Gemini and Sagittarius
They both love to explore, go on adventures, try new things, and have amazing conversations. Neither enjoys feeling tied down or boxed in; they’re both free spirits, getting as much out of life as they possibly can. Fire sign Sagittarius also shares a deep intellectual connection with Gemini.
Sex: With sexual compatibility as high as Gemini and Sagittarius, there is plenty of excitement and interest between the sheets. Because neither considers sex a big deal, it adds a sense of passion to their sexual relationship, but their mental stimulation, above all, is the driving force.
Long-term Relationships and Marriage: Boredom is an enemy to both, so Gemini and Sagittarius may find themselves so overscheduled that they barely have time for one another. In addition, if they don’t try to sync their schedules, they may end up not only physically worlds apart but emotionally, too.
However, when these two are together, there’s laughter, discussion on matters of the material and philosophical world, and endless stories of adventure.
Gemini and Capricorn
Love: Since Capricorns are very mature, determined, and reliable, they may make Gemini feel like a child or teenager. Geminis can be much more playful and unrestrained than Capricorn, and Capricorn may find Gemini irresponsible and foolish.
Sex: Despite popular belief, Earth sign Capricorn enjoys fulfilling sex, but feels Gemini is a little too out there for them.
Capricorn needs to relax in the sense of the expectations they hold, and Gemini needs to realize that their inhibitions are a turn-off. All in all, they don’t think of each other as exciting, putting a hamper on any sexual chemistry.
Long-term Relationships and Marriage: There are some differences between people that make it exciting, and then there is the kind that causes annoyances, misunderstanding, and sometimes even a little dislike.
Unfortunately, Gemini and Capricorn have the second kind of differences, and it’s hard for them to have an appreciation of them. Capricorn needs to loosen up and let down their guard, and Gemini needs to grow up a bit for a union between these two to work.