Happiness and harmony are very important in married life hence it is considered to be a major criterion in horoscope matching. Gana Porutham studies the sexual compatibility between the couple for a blissful married life. Birth Stars are grouped under 3 categories:

• 1. Deva Gana
• 2. Manushya Gana
• 3. Rakshasa Gana

The following table determines Gana Porutham between the couple:

When both the Birth Stars fall under Deva or Manushya Gana, they are extremely compatible according to the horoscope matching theory. While the bride belongs to Deva Gana and the boy belongs to Manushya Gana it can be considered as a secondary compatibility. When both belong to Rakshasa Gana it is not a favorable compatibility.