What's the evolutionary advantage of certain animals having small penises?

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But why didn't they evolve big dicks like humans did? Humans realized that big penises were necessity to ensure the survival of our species. Our women even have a built in distaste for small penises.
I wonder if this is a result of our social lifestyles and mastery over tools. Our ancestors were less susceptible to the elements since we built shelters and formed small communities. Now that they're not dying so easily to nature the evolutionary pressures change and allow for more fine-tuned adaptations such as a larger penis.
Humans are some of the most infertile animals on earth despite fucking every couple of days year around. I do wonder if bigger dicks evolved to minimize the amount of fluid needed.

Or maybe we are so infertile because we love to fuck so much. Women cant just stay pregnant all the time. And how many kids could a man support? At some point higher fertily is detrimental.

Other animals are 3 pump chumps but they get the job done without needing to try dozens of times to get pregnant.
 
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