The mystery of Sauron's lost finger

[Bombadil]

How could a finger like Bombadil get Goldberry for a wife?

Ah yes, well you see this is why Bombadil had to kidnap Goldberry:

He caught her, held her fast! Water-rats went scuttering
reeds hissed, herons cried, and her heart was fluttering.
Said Tom Bombadil: 'Here's my pretty maiden!
You shall come home with me! The table is all laden:
yellow cream, honeycomb, white bread and butter;
roses at the window-sill and peeping round the shutter.
You shall come under Hill! Never mind your mother
in her deep weedy pool: there you'll find no lover!'

Then over time she developed the stockholm syndrome and fell in love with Tom.