"There's 20 bucks in it for you!"
The whole "Spider-Man's opposite" thing becomes even more obvious when you consider that David Michelinie, one of Venom's creators, originally wanted the character to be a woman. But not just any woman: a pregnant woman about to give birth, whose husband is hit and killed by a taxi because the driver got distracted by Spider-Man. In the story that Michelinie envisioned, this would then cause the woman to go into labor on the street, and lose the baby, her husband, and her sanity all in the same night.
But I'm sure that getting fired was equally devastating for you, buddy.
After getting out of the hospital, this proto-Female Venom (Fenom) was supposed to bond with the alien symbiote, the source of Venom's power, and become a sinister villainess whose main thing was that she didn't trigger Peter's spider-sense, and could thus attack him from the shadows.
It's also worth mentioning that the comic book symbiotes have the ability to "give birth" to other symbiotes, which would fit beautifully into a story of an insane, grieving mother who lost her child. Unfortunately, Marvel editor Jim Salicrup thought that a woman, even when smeared in extraterrestrial vegemite, wouldn't be a believable threat to a teenager with spider superpowers. That's when Michelinie reworked the idea and came up with the Eddie Brock Venom, effectively robbing us of a chance to see a truly unique baddie beat both Spider-Man and 1980s comic book sexism harder than some readers would've beaten their dicks to this character, probably.
Adam Jay, SuperHero Photography/Freddie Nova