Why do guys go limp in the middle of sex?

Anonymous
On 3 separate occasions (3 different guys, 2 were mid-20s and 1 mid-40s) we were in the middle of it and we go to change positions and all of a sudden the guy goes limp. We go back to square one and start over again, but wth? Is this a common problem among other casual sex-ers? And what is the issue here?
Why do guys go limp in the middle of sex?
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