In all seriousness, one of the sure-fire tests whether impotence is caused by physical (very rare) or psychological (quite common) reasons is to tie a thin stri

In all seriousness, one of the sure-fire tests whether impotence is caused by physical (very rare) or psychological (quite common) reasons is to tie a thin string around your penis before sleep. If you wake up and the string is broken, it's a psychological problem, because every man experiences unconscious tumescence several times a night. "Morning wood" is just when you happened to wake up during one of those cycles. :)