I get that Tolkien was a staunch Catholic, but he was also a preeminent philologist trained in a way that few people today are. He was deeply familiar with all forms of human myth. To blindly assume that all characters in LotR must have a Biblical corollary is lazy. Tom Bombadil "rapes" Goldberry (in the ancient sense of the word[1]) in The Adventures of Tom Bombadil that comports nicely with other myth cycles and not very well with the idea of the "first Man" or "Adam" (it's not even clear that Bombadil is Eru's direct creation). I think if you actually read the secondary Tolkien texts you might see it differently. They are almost all worth it.

But one day Tom, he went and caught the River-daughter,

in green gown, flowing hair, sitting in the rushes,

singing old water-songs to birds upon the bushes.

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 laden...

[1]https://www.etymonline.com/word/rape#:~:text=rape%20(v.),abd....