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Because the muscle that normally prevents blood to concentrate in the penis relaxes, allowing it to swell.

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Q: Why do you get an erection when you are tired?
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A drug induced erection.


What is the scientific word for a erection?

The scientific word is erection.


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He got an erection. May be true or just an expression of his feelings.


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Prolonged erection is an abnormal phenomenon with regard to penis health. This is caused by taking drugs like viagra for this purpose. Male without confidence in their capacity for erection, tends to take pills before sexual encountrol to prolong erection. Natural penis erection is the best method when dealing happy sex life.


How can have a full erection while having enlarged prostate gland?

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It is important that you understand physiology. Sexual attraction is not necessary for an erection. It is necessary for one to be gay. All that is necessary for an erection is physical contact or stimulation.