Domineering, controlling heroes are dominating the romance world lately (heh!). Something about a hero being in absolute control of the heroine—even as she rebels against it—seems to appeal to romance novel readers.
For example, heroes try to control what the heroine eats, wears, sees, lives, works, and drives.
But if you were a romance novel heroine, what controlling behavior would you absolutely not tolerate? What heroic behavior would be your hard limit?