A member asked:

Why are erections controlled by the emotions?

A doctor has provided 1 answer

The autonomic system: Blood pressure, heart rate, breathing rate are influenced by your emotions--i.e. Being nervous/anxious can increase heart rate/blood pressure, and breathing etc.. High anxiety state constricts blood vessels hence reducing blood flow, thus reduces erection quality. Nocturnal erections are often of good quality because your mind is relaxed, enlarging blood vessels and hence flow/erection. So, relax.

Answered 6/11/2017

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