I don’t always like it. I don’t like it when the rake is just a womanizing jerk. I like it when the rake likes women and sees them as people who enjoy having a good time (generally merry widows or wives in unhappy arranged marriages or happy marriages of convenience). He hasn’t found one he wants to settle down with yet, until he meets the bluestocking.
They’re both fighting against the strictures of society. He accepts her ways because he hates society’s ways. She craves the knowledge she believes only he can give her.
And yet, they’re also both rebelling in ways that society has prescribed them. The woman cannot be a rake, she can only be a bluestocking. The man cannot be a bluestocking and still rebel. When they meet, she allows herself to indulge in sensuality, and he is allowed to share (and wallow in) his love of whatever academic subject he has hidden from his rakish friends.
They’re smart. They have intelligent conversations. They have witty senses of humor. They share jokes that nobody else gets. There’s lots of narration about their eyes, which sparkle with intelligence and humor. They like each other.
They are people that the reader might like to know in person. Or that the reader might even be, in another world.
And by meeting each other, they are allowed to be even more themselves, not less. They free each other. She allows him the ability to settle down and follow his true loves without caring what society thinks. He allows her the freedom that she can only get through marriage to a husband who does not view her as property (or as a wealthy widow). And they share many passions.