Prior to his marriage to Hera, Zeus associated with a number of the Female Titans (and his sister Demeter). These connections are ordered by Hesiod as follows: (1) Metis; (2) Themis; (3) eurynomas; (4) Demeter; (5) mnemosyns; (6) Leto.
Aphrodite later had an affair with Zeus of her own free will, but his jealous wife Hera placed her hands on the goddess’ belly and cursed her offspring with deformities.
According to many versions of the story, Zeus took the form of a swan and raped Leda the same night she slept with her husband, King Tyndareus. In some versions, she laid two eggs from which the children hatched.
Zeus and Metis
His first and dearest lover was Metis, a Titan goddess and mother of Athena.
Zeus took another lover, mortal Semele after seeing her sacrifice a bull in his honor. Zeus often visited Semele and she became pregnant. Hera discovered Zeus’ infidelity, tried to befriend Semele, and, knowing that mortals cannot look at the gods, made her beg Zeus to show himself in all his glory.
Zeus fell in love with Semele, daughter of Cadmus and Harmonia, and began an affair with her. Hera discovered his affair when Semele later became pregnant, and persuaded Semele to sleep with Zeus in his true form.
Zera is an extremely unpopular couple. Ever since the PJO series, many have hated Hera. Zeus cheated Hera over a hundred times. In the end, however, she always forgives him.
Ganymede, a handsome Trojan young man, was tricked by Zeus into serving among the other gods as his personal cupbearer and lover on Mount Olympus.
Zeus fell in love with Io and seduced her. To keep Hera from noticing, he covered the world with a thick blanket of clouds. This backfired and aroused Hera’s suspicions. She came down from Olympus and began to disperse the clouds.
Zeus issued a decree that the gods were not allowed to interfere in mortal warfare. Hera is on the side of the Achaeans, so she plans a deception of Zeus where she seduces him with the help of Aphrodite and puts him into a deep sleep with the help of Hypnos so that the gods can intervene from outside the fear of Zeus.
Why is Zeus married to his sister? To hide her shame, Hera agreed to marry him. It was an abusive marriage at best. Although Zeus had pursued his sister and tried to possess her through marriage, he never gave up his lustful ways.
One day Zeus turned into a swan and came to Leda to protect himself from an eagle. Then he seduced her (in some poems and works of art it is portrayed as rape). She got pregnant and laid two eggs (why not?).