Well it happens to me when I'm really high on sumthin that numbs up my ....like right now as I'm writin this thrusting my stiff in gooey glove between bed
do you mean first thing in the morning? Or are you referring to some other time?
perhaps it is because you are watching? IDK, I just did a quick google and it appears that it is not normal to do so, but not impossible either.
Testosterone surge....... mx:))