Like all of the pairings between two signs on opposite sides of the zodiac from each other, you represent different ends of the same stick. The name of the stick in this case is knowledge. Both of you are very concerned with mental activity. The difference is that you are concerned with short-term knowledge, the here and now, like what's in the news today; the Sagittarian is concerned with deep knowledge, the eternal, and what's in the serious literature on a given subject.

As lovers, you can have a lot of fun together. The Sagittarian will teach you things, and they will enjoy your teasing them. They are a lot more physically demanding than you would think. This is due to the horse at the bottom of the sign. All animal-sign people are animals to some extent.