The sympathetic and the para-sympathetic nervous systems
The sympathetic and the para-sympathetic nervous systems.
Right then, the sympathetic system is for kicking ass, running in forests and giving power-point presentations, and the para-sympathetic system is for getting strong erections, to reach your maximum size, and possibly to help you last longer in bed.
So, how might one conciously control which system you are using?
One way would be to fall asleep during sex, but your partner might not appreciate that… (j/k).
Lets all have a mass debate over this.