I find it fascinating to see the Sagittarius and Virgo couple because it was a rare combination! Unless they both have harmonious aspects in their placements. Mutable signs couples know how to have fun, everyday they find something interesting so their dynamics are never boring. The main problems (in the long run) may lie in their vision of how they approach their goals. The differences between earth and fire signs are too broad, but that does not mean they can't achieve it together. As an earth sign, Virgo is not meant for a risk, they like safer options. While as a fire sign, Sagittarius is impulsive, they are the type to take action first rather than have to think through. Thus understanding each other's boundaries is necessary to avoid tense situations.