Science behind cuckoldry?

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Whenever I watch cuckold porn it appears to me that the cuck tends to be diminutive in some way. They either have a small penis, are bald, or are short. As an aside, it seems that most transgender people are weak men. Is there a reason behind this? I know in some animals when one becomes dominated they turn into a female. Is cuckoldry that in humans or is it simply a disease of our times?