Question

Why is penile erection controlled by parasympthatic nervous system not sympathetic nervous system

Answer 1

The sympathetic nervous system gets the body to fight or get away whereas the parasympathetic nervous system helps in body relaxation.
 while during intercourse , it can be exciting for a man but he needs to be relaxed to get everything done right so the parasympathetic nervous system is used to help keep body relax during ejaculation and erection.  hence parasympathetic nervous system controlls penile erection as well as all the other sexual behaviours of men during copulation. 
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