Why do we, as human males, find the images of women being fucked

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Why do we, as human males, find the images of women being fucked by other men attractive?

I can understand that seeing a naked female body is what gets us hard, and it's meant to so that we can feel the urge to recreate with them. But shouldn't the idea of another male dominating the female that we desire anger us instead of stimulate us? The other male, the alpha in this situation, is reaping the bounty for himself. And not only do we sit back and watch, but also waste our reproductive resources while doing so.

In other words, are people who watch porn, dare I say... cucks?