The signs that are most compatible with Pisces in a romantic relationship are Taurus, Cancer, Scorpio and Capricorn. A person born under the Cancer, Scorpio or Capricorn sign also has the best chance of communicating with a Pisces.
Gemini and Sagittarius have little chance of a romantic hook up with a Pisces. A Pisces and another Pisces score very high on the sexual compatibility scale, but an Aquarius and a Pisces do not go well together.
Astrological signs are not the only indicators of compatibility. In addition to the Sun sign, the positioning of the stars and planets at the time of birth of both partners is also very important to astrologists.