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A guy with a smaller wang can fuck better than a guy with a bigger one, but that’s why he’s more skilled.
But size always help.
As far as we don’t talk about asinine sizes.
And width helps better than length.
You may not realize it, but human evolution favored larger genitals, so as a result a certain little thing in the back of our minds screams how important it is.
In equines on the other hand, evolution favored sex being fast to avoid predators, with the entire process from insertion to exit lasting roughly 20 seconds.
Mares have incredible muscle control, and can ensure a snug fit no matter how big or small their partner is (within reason.).
But bigger = last longer? That’s a lie.