When a girl wears leopard skin print dress, guys get excited. Just why?

I notice that the girl with animal print (zebra, tiger, panther) dress makes her entry, guys collectively emit a sigh and I can immediately notice a change in the trousers of many men. But when the girl wears leopard skin print, the effect is most visible. Have others observed this as well?

These dresses bring out the animal instinct in men
Girls with such dresses are expected to behave in a different manner and hence guys get thinking with their groins
Such dresses do make girls look beautiful and there is nothing more about it
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When a girl wears leopard skin print dress, guys get excited. Just why?
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