When the singer Katy Perry spoke recently about her relationship with British comedian Russell Brand, not so long after their whirlwind courtship and immediately after their whirlwind divorce, she refrained from putting the boot in, despite Brand having ended the short marriage by text.

Her interviewer, from Elle magazine, suggested she might be attracted to the Byronic type: "mad, bad and dangerous to know."

"Byronic?" Perry queried. "I'll remember that word. But that's not right. The men I have gone for are challenging, but they're also wildly intelligent and poetic."