What’s the psychology behind (some) men liking submissive and vulnerable women?

I was out with a guy and he straight up told me he loves it and it turns him on if a woman is vulnerable & submissive. He likes caring for his woman and the idea of protecting her gets him. So i was wondering what would the psychology of this be, like why is that attractive to him? Does he want to feel needed?
What’s the psychology behind (some) men liking submissive and vulnerable women?
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