Demeter used to be in love with the Greek hero Jason. They laid together three times in a field and brought greek god Plutus into existence, the god who symbolized earthly wealth, and the demi-god Philomelos who invented the plough.
According to a myth, Zeus, the King of the Gods, killed Jason for his impudence to lay with a goddess; after that, he managed to seduce Demeter, their offspring being the goddess Persephone. Persephone later on was abducted by greek god Hades to the Underworld and she became the Queen of the Underworld.
Poseidon, the Greek god of the Seas, also approached Demeter to lay with her and bring fertility to earth with his wet elements. Demeter tried to avoid the god by turning herself into a mare, but Poseidon then took the form of a stallion and captured her. From their union Demeter gave birth to two children: the stallion Arion, god of the horses, and Despoena, the goddess of fruit.