Poseidon (2010 film)

Poseidon was the god of the sea, the father of the demigod Agenor, the husband of Amphitrite, the brother of Hades and Zeus and the uncle of Perseus.

Amphitrite
Amphitrite is Poseidon's wife. She is neither seen nor mentioned, but he did have other affairs with other mothers. But Amphitrite isn't shown having any resentment of the children in the myths, as she hardly seeks revenge like Hera does.

Medusa
Poseidon attempted to seduce the priestess, Medusa. Athena caught them having sex in her temple and cursed Medusa so Poseidon would never want her again.

Io
Poseidon tried to seduce Io, but she refused his advance. Instead of doing anything rash, all he did was curse her with immortality, unless she falls in battle.

Trivia

 * Poseidon was featured in Percy Jackson and the Olympians: The Lightning Thief