The Greek Gods slept around a lot--from Hephaestus wiki:

Hephaestus and Aphrodite

Though married to Hephaestus, Aphrodite had an affair with Ares, the god of war. Eventually, Hephaestus discovered Aphrodite's affair through Helios, the all-seeing Sun, and planned a trap during one of their trysts. While the lovers lay together in bed, Hephaestus ensnared them in an unbreakable chain-link net so small as to be invisible and dragged them to Mount Olympus to shame them in front of the other gods for retribution.

https://en.wikipedia.org/wiki/Hephaestus

The gods laughed at the sight of these naked lovers, and Poseidon persuaded Hephaestus to free them in return for a guarantee that Ares would pay the adulterer's fine, or that he, Poseidon, would pay it himself.

He was born with a club foot and was the son of Zeus and Hera--Hera threw him out bc of his disabilty.

He was a smith--and the God of Volcanos.

More from that wiki:

An Athenian founding myth tells that the city's patron goddess, Athena, refused a union with Hephaestus. Pseudo-Apollodorus[73] records an archaic legend, which claims that Hephaestus once attempted to rape Athena, but she pushed him away, causing him to ejaculate on her thigh.[74][75] Athena wiped the semen off using a tuft of wool, which she tossed into the dust, impregnating Gaia and causing her to give birth to Erichthonius,[74][75] whom Athena adopted as her own child.[74]

The Roman mythographer Hyginus[73] records a similar story in which Hephaestus demanded Zeus to let him marry Athena since he was the one who had smashed open Zeus's skull, allowing Athena to be born.[74] Zeus agreed to this and Hephaestus and Athena were married,[74] but, when Hephaestus was about to consummate the union, Athena vanished from the bridal bed, causing him to ejaculate on the floor, thus impregnating Gaia with Erichthonius.[74][76] Nonnus refers to this tale of Erechthonius being born of the Earth after a "makeshift marriage", but says that Athena then nursed Erechthonius on her "manlike breast".[51]