Why does Gilgamesh refuse Ishtar's offer of marriage?

Answer: When Gilgamesh and Enkidu return in glory, the goddess of love, Ishtar, proposes marriage to Gilgamesh. If he consents, she will shower him with many gifts, including a wondrous golden chariot studded with lapus lazuli, and will cause the mightiest rulers to kneel at his feet and pay him homage. But Gilgamesh refuses the proposal, telling her that he could not abide the infidelity for which she is famous. He recites for her a list of the lovers she enticed and then rejected. She turned one of them into a mole, another into a wolf. Deeply insulted, she petitions her father, the god Anu, to loose the great Bull of Heaven against Gilgamesh. Though Anu is well aware of his daughter's wanton ways, he gives in to her request after she threatens to break into hell and release the dead to work havoc among the living.