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Anonymous
Remember that the head of the penis is designed to pull out the cum.
Most mammals when they cum leave a hard plug. The semen dries up very hard. Also, the males of these animals have a pointy penis that is designed to break up the plug so they can shoot past it.
In humans, we leave a soft plug, like jello. The head of the penis plunged into it, it gathers under the head, and it gets pulled out. This is how humans accomplish the same thing. It's also why the human penis is soft and flexible.
So the answer is one. One guy cums, and the next guy can pull most of it out so he can put his in there instead.
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