Her nickname for him
His attraction for her is understandable. Her attraction for him? Not all that clear, really. Unless size really does matter? For me, no. Size can be uncomfortable. For her, clearly a selling feature. Because she's been going around telling her friends about it. And her nickname for him, which she hasn't been shy about sharing, is "Monster Cock". Which is flattering, I guess, if you're in college or Vegas. But it's probably a little immature and maybe even a little disrespectful, all things considered.
Top suspects: Miranda Kerr/James Packer, Jennifer Lawrence/Chris Martin, Mariah Carey/Nick Cannon