What happens when you drop a male rat into a cage with a receptive female rat? First, you see a frenzy of copulation. Then, progressively, the male tires of that particular female. Even if shewants more, he has had enough. However, replace the original female with a fresh one, and the male immediately revives and gallantly struggles to fertilise her. You can repeat this process with fresh females until he is completely wiped out.
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