Here are some...: Very likely, what he experienced is at the time of being tired or over-exerted or / and trying to have coitus numerous times during a short period like 3-8 hours. If such, he would do just well for the first or second time, but start not being able to keep up in his 3rd or 4th... attempt. Thereon, the harder he tries, the worse he may be in achieving erection due to fear for failure kicking in...
Answered 7/21/2015
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