The brain controls our bodies and function. This is why men can control being aroused at work, in the gym or on a date.
During REM sleep, parts of the brain are also in a sleep-like state. This gives the penis, the freedom to literally do whatever it wants.
He’s a total man’s man in the mornings because he’s hormonal.
Guy’s testosterone level is at its highest early in the day around 25% to 50%. As the day progresses, the levels begins to dip.
A man’s penis wants to be in tip-top shape at all times so when the time comes to perform, it is ready for action.
One theory behind morning erections is that the penis is exercising. During an erection, the penis is filled with blood and it has to hold that for an extended period of time.