Not getting a boner when we want one can have a negative effect on us guys. One thing to check for, before getting too upset or worrying too much, is the morning erection.
When you wake and look down, more often than not, is your cock looking up at you and waving "Good morning, good buddy?"
Our cocks can be fickle things - relentlessly begging for attention one day
and ignoring our pleas for cooperation the next.
This is not at all unusual. Our physical health is a factor, but so is our mental disposition. Being distracted by other things can be a real dick downer. Oddly enough, sometimes we can overcome that if we give our brains over to the sensations.
But, morning wood is still a good indicator of how we're feeling.
Guys, how often do you have a good, hard morning?