The alien warrior queen Caiera.
Say what you like about the Hulk, but he's reliable (to be fucking insane with rage.) Great teeth, too.
Aside from the obvious (that he may flip out, grow six feet, and demolish an entire city block because it was suggested they're getting a little paunchy) there's anatomical compatibility to think of. Bruce Banner may have the tiniest, most adorable member imaginable, but once he Hulks out, that thing becomes weaponized.
"Weaponized" is actually a literal description. Every single fluid the Hulk produces is so radioactive that a Hazmat team would rush into the bedroom every time he climaxes.
The Hulk is cursed. A happy Hulk is not a Hulk at all, so in the comic book universe that means bye-bye to anything that might bring him peace (like, say, a happy relationship.) This is bad news for anyone hoping to settle down, maybe buy a house in the suburbs, and pump out little Hulks.
Case in point: When the Hulk took his second wife, Caiera (yes, he's been married twice) it was on a planet he'd recently liberated from a despotic overlord and saved from an alien menace. She was a proud warrior queen, making her capable not only of withstanding Hulk's temper tantrums, but also his immense mojo.
So, the Hulk basically became king of an entire planet, married to his perfect woman and is surrounded by people who love him to pieces. What happens?
A massive explosion kills everyone except Hulk. Insert trumpet going "Wah-Wah-Wah-Waaaaaaaaaaaaaah."
To be fair to Hulk, we don't really know how good of a husband he would be long-term, due to the incredibly short lifespan of his wives. And though it's probably not much consolation to them, nothing that happened to either of his wives was his direct fault.
The same cannot be said for the next guy on our list ...